As inspired by my thoughts on this post, the reason El not being with Mike is better for her character is because it deepens her character.
She did not know who she was in season 1. She only really wanted one thing at that point besides safety: Mike.
In concept, it seems 'happier' for whatever given character to 'get the guy'. But it would imply a certain level of tunnel vision for her.
That after all this exploration, looking into her family history, making friends - specifically more relationships with women, forgiving herself...her goals were the same. There's a subtle message in that that it....didn't do anything.
If she wanted one thing when she didn't know herself and that's still what she wants - or at the very least, all she's pursuing - by the end, one could be prompted to ask: does she still not know herself? Not because Mike doesn't make sense with a self-actualized version of her, but because he has been narratively associated with that version of her that does not know herself yet.
Her arc is to knowing herself.
That arc is disappointing and inconsequential if there is any implication that she was simply "right the first time". An implication that if what she needs to be happy is primarily Mike...that that other stuff wasn't that important. Only peripherally, that is.
Her screen time does not make sense if she ends up with Mike. Not just because of lack of build up or something but because what her time was spent on needs to be about something. Because she got with him so early and spend all the time in the middle learning about herself, being with him in the end is not her ending up with him, it's her returning to him. Even though they were always together, because of her focus shifting throughout the seasons, it will still feel like that.
"She explored the world to find the thing she needed was right in front of her" is a sweet trope.
But not for her. Not for a character who needed to explore the world. Her exploring the world was not for to have comparison, there was no plot about her not being grateful enough for what she had to start, she did not leave him only to find the perspective through that exploration that she was wrong to.
That is not what happened.
She didn't need to see the world because she needed perspective on situations she was currently in, she needed to see the world because she didn't see the sun until she was fucking 12 years old.
It's a very different plotline.
By screenwriting principles, things need to happen for a reason. And if she ends up with Mike, let alone if there is any focus on it at all - which there has to be to justify doing it to Will, because it deeply affecting him and being just casual or anything short of epic true love to them is just cruel.
But either way, if she ends up with Mike, she will be ending up where she started. That is something a story cannot do. Seasons 2-4 of her exploring herself need to have an impact on her decisions.
There is no plotline that fits screenwriting rules that goes "I made a decision that I felt good about, then went and learned about the world, and confirmed that what I wanted was that first thing". Because even with the version of that trope I described, it requires learning something. A change of perspective.
But in season 1, El stands by the choice of being with Mike and she did not leave him. Her initial branching out into the world with Hopper and her mother and sister was not a result of a choice to go away from Mike based on any belief about their relationship that she had to change her mind about.
El ending up with Mike would make her entire show plot:
"I thought I was right about Mike making me happy and I was"
The entire middle section could be cut. They could have just lived happily ever after because the only choices caused by her exploration that she has ever made in that relationship were to leave it.
She made a new relationship with another girl who helped her understand what she liked - fashion, hair, ice cream flavors, and treatment/behavior: boundaries.
And she used that newfound knowledge to leave him.
When she got with him she didn't know anything about herself yet.
When she reunited with him, she still had had minimal comparison.
When she went back to him, she had not learned anything new from her environment since breaking up with him that led to that decision.
El ending up with Mike would invalidate the need for all of amazing abuse and feminist representation in her arc. It would heavily imply that it was essentially useless to her main goal and therefor inconsequential. That is horrible for the character that has been written and her needs: to say her female friendships, positive father figure, developed practice of her boundaries and self-advocacy, forgiveness of herself
...All did not matter because she was able to be with Mike happily before any of them were true.
She was able to be with Mike happily before any of them were true. To validate at all the message they want that women's autonomy is important, and is especially empowering in women abused, they need to represent that all the things she learned about that changes that truth with Mike.
To say "abused women can find independence and empowerment through self-advocacy and a gradual transition from dependence on healthy figures to independence", they have to also say "what was true about her before she did all those things is no longer true".
And what was true before all those things is she was perfectly content being with Mike. That was her plot, a focus. It isn't just a side detail that doesn't need to be altered by the autonomy plot.
To keep El with Mike would be to keep her in the state she was in before she was empowered, and to say she is happy in that same state is to say that her empowerment does matter towards her happiness.
El's character becomes infinitely more deep in writing and better treated in-world if she does not end up with Mike.
Because not ending up with your original tunnel vision goal that you had before you knew yourself is not to say "I can't have the things I want".
It is to say "my life is so rich and full know, I have such depth of knowledge of myself now, that I know there is so much more to my life than what was once my whole world".
Just like the opposite plot example I gave, it's all about perspective changing. Except in this case, it's not about her going "I thought the world was better, but you're my world".
It's about her going "I thought you were my whole world, but there's so much more for me out there to explore".
El's whole traumatic backstory is captivity. And containing her to one desire from beginning to end is a form of narrative captivity for her.
When her options are Mike or the world, as they have been written to be, it is no more appropriate to choose Mike for her than it is for her to continue to be unallowed to go outside even into her happy ending.
And really, this is all about something in screenwriting called the "delusional belief". You think you want one thing at the beginning, only to find out it was something else that would fulfill you in the way you thought the first thing would all along.
It doesn't just break screenwriting structure to say "before she knew herself, she thought she wanted him and she was right (so I guess she didn't really even need to get to know herself)", it also flattens her character. Not just in-world, this also has writing consequences.
Audiences cannot attach to her the same, so she does not have the same impact, that is what I mean when I see it would be a disservice to her character. That in that way, it would be a disservice to us. Robbed of the ability to relate to her because she is dulled down to so bland that none of her growth even matters.
Wanting something and being right about and never not knowing that for more than a couple episodes is not a relatable arc. It isn't even an arc, actually.
For El, MIKE AND EL'S RELATIONSHIP DOES. NOT. HAVE AN ARC.
There are season plots. That is not the same. And a conflict then resolution is not the same as a character arc if the conflict and resolution are simply regression and recovery, or they do nothing to grow the individual characters.
When Mike learned to trust El, that had no impact on her character. She was already advocating for her boundaries and whether he succeeded to fulfill them or not would not change that.
I have also said before that El begins seriously considering getting back together with him after overhearing the "I love you", making her decision a regression based on her idealization of fictional romance (as we see when she's watching tv in season 2) and deprioritizing those boundaries slightly to pursue it, letting things slide that she wasn't as much before.
There is a change, per the season plot - not character arc - but her motivation is not new knowledge, it is regression into her season 1 and 2 fantasies. She wanted true love like in the movies and when that became available to her, she deprioritized the lessons she had been learning, even if just slightly, in favor of the idea of someone loving her like that.
The same is true for season 4, when Mike told El he loved her, that had no impact on her character. Her arc was about loving herself via forgiving herself. To have achieved that in the first place, it needs to be true regardless of whether he loves her. So it's nice that he does, but it isn't impactful to her character arc.
Her character arc is about the importance of going out into the world and meeting lots of new people who teach her lots of new things that all contribute to her knowing herself better and loving herself as best she can with self-assuredness and good boundaries.
To claim that her arc is about Mike is about as deep a disservice as you can do to her character.
To look at an independent woman recovering from abuse as she establishes boundaries and say "a man's love was the answer". I saw a wonderful comparison between her and Ophelia a long time ago, with the visual parallel with El lying in the water in 4x09. What she was hurt by was men and their desire to even "save her" in the first place. So the only thing that could save her is herself.
Even when successful or kinder and safer, it is still all the same. "I only ever wanted to protect you" - Brenner, "What if she doesn't need me anymore" - Mike, "I protect and I feed and I teach" - Hopper.
All the men in her life are attempting to save her. And much of that support is helpful - but it's just that: support; assistance. Not the solution. They are not her "savior".
And that is the disserving claim that credited Mike with her happiness and happy ending would make. That a man saved her from sadness without her having develop any of that autonomy or self love, that part was just for kicks.
Her arc is about going out into the world and meeting lots of new people and learning from them how to love herself and have good boundaries and be independent and empowered.
That is why Mike is good and focal for it in season 1. He is the first of many people who will help her with this along the way.
Mike: You're not the monster.
Hopper: I know [you can fight]. But right now, I need you safe.
Max: Not Hopper. Not Mike. You.
Even Henry: Papa doesn't always tell the truth. - That was huge for her. To validate her intuition and take credibility away from those who sourced her self-blame.
They are each pieces in her story. Her story is not anyone else's and if it were "her and Mike's story", it would be. That works for some characters, but not her. She needs to be able to have things that are her own. Most of all her life. Her story. That can exist outside of any given person who enters it.
Her arc is about lots of people she meets by going out into the world helping her learn to love herself and set boundaries.
It cannot be about one person she meets teaching her that true love is the answer and all her other plotlines are accessory.
It doesn't matter what happens in between. If her 4x08 epilogue is happy and in love with Mike, that will be the claim.
What does her life look like once it's normal: that's what tells us what was truly valuable about what came in the past 5 seasons.
And to say Mike would be to say "nothing". Because that is not what she has spent all her time and heart on. He has been present and appreciated, but he has been accessory.
El cannot end up with Mike because it would make her a two-dimensional character with a singular goal that she achieves and...that's it.
Not ending up with Mike would make her an incredibly deep character with rich, evenly spread relationships - none (like Mike) prioritized over the others - because this is about the different aspects they all individually add to her life equally and in not getting the thing she wanted when she had a one track mind, it allows her to expand the bounds of that view from much further than one track.
Even as a nuanced and deep whole person who had one goal and one thing in season 1, Mike, if she had lots of different cool nuanced things but was still with Mike, I can only think the tunnel vision is still there.
That she has one thing so she sees one thing. But then in the end, she has dozens and still only sees one. That's bad. She needs to know as much about herself as possible with maximum points of comparison to explore and appreciate, and learning from all outlets provided to her.
If she ends up with Mike, she will still have everything she gained over the seasons. But she will not be receiving any of it.
Because if her focus is in the finale what it was in season 1, that implies it was the same all the way through. Her ending being about Mike makes the claim that her plot was about Mike.
Which is so sad. Now it is this tragedy about a girl so focused on one boy that even as the world was giving her so much more she never knew she wanted, as a result of that she never knew she wanted it, she never even looked up to see it and be influenced by it.
That the story is no longer about how Mike taught she's can be a hero not a monster, Hopper taught her her life is more important than the use she is of to others, Max taught her that her opinions matter, and her memories of Henry taught her to forgive herself...
But it is now about how Mike taught her that she can be a hero not a monster, her reunion with Mike taught her how wanted she is in Hawkins, Mike taught her that she's worthy of love, then Mike taught her her mistreatment wasn't her fault.
It is all credited to Mike. If her ending is Mike, that claims her story was Mike. And if Mike is credited with everything she did for herself, she is robbed of her autonomy as a character, a woman, and an abuse survivor, she is robbed of her autonomy because it is to claim that SHE NEVER SOLVED A SINGLE ONE OF HER OWN PROBLEMS.
That she is therefore still dependent. Because if everything is saved only by the power of love, then it is also true that she cannot do it on her own.
If she stays with Mike I can't relate to her. Not because she's happy in her straight relationship. But because it would rob her of any growth and value she had on her own to her other plotlines, making her a one-note character whose only job was to receive love.
An object. El ending up with Mike would make her an object of his affections, someone whose every internal conflict was saved by his love. And object of affection....is still an object.
By making Mike El's happy ending they claim that Mike was her story. And by claiming Mike was her story, they turn from a person to an object. Nothing more than someone he saved.
People act like these love triangle endings are interchangeable. They're not. It's a testament to how well written it is that they are absolutely immovable.
It isn't "El is as she is either dating or not dating Mike".
It's: El is either represented as an independent woman abuse survivor....