"Will's arc is about acceptance"
NO. Actually, we KNOW what a queer arc about acceptance looks like. Robin's.
As Maya just put beautifully, Robin's arc is about finding the first person who accepts her, Steve, and a transition not just from finding that person, but then getting to BE that person to someone else, Will.
ROBIN'S arc is about acceptance. She calls herself an "error", similar to how Will calls himself a mistake. Then she comes out to Steve, assuming she'll lose him immediately, and he accepts her. She gains the joy of adolescent gossiping about crushes and the excitement in that. Then she finds someone younger, going through what she was before she met Steve, and she reaches out to him, getting to be the person she needed at that time in her life.
That is a BEAUTIFULLY written story about queer ACCEPTANCE.
And hell, even she gets romance on the side!
And it is also how we know: Will's is not about that.
It looks nothing like it. They clearly demonstrated through Robin the understanding that yes, it is entirely possible to be aware you're queer without an established onscreen love-interest, let alone a long-term one, to center friendship as the most valued opinion and support for your queerness with it being the prioritized relationship in your screentime - the relationship with whoever's acceptance is most centered in the arc whether that be friend of family - then the freedom of someone truly knowing you, even if it's just one person.
Will's centers his love interest and romantic feelings, which are long-term, his primary want is shown to be romance, where Robin's was explicitly stated to be acceptance with no mention of romance, and all of his screentime is prioritized to be one on one and center the acceptance of his love interest. Not his mom or his brother, not his friends in the party.
Robin says: "we all just want to be cool. Accepted."
Her primary want is explicitly stated to be acceptance, not romance.
WILL'S PRIMARY GOAL IS EXPLICITLY SHOWN TO BE. ROMANCE.
They give characters what they want. Which means they make them want what they're going to give them. They do not say "have you ever considered you actually didn't want that all along?" ESPECIALLY to QUEER PEOPLE of all people are you FUCKING KIDDING ME? I mean, you can't say that without hearing it as you say it.
Once, again, as always, THEY KNOW HOW TO WRITE IT. They've PROVEN that. They're choosing not to. And it's easy to see why. If not a different outcome, it's fucking malice, withholding something they've demonstrated full ability to successfully. So I'm choosing to assume it's because they're intending a different outcome.
We know what it looks like. They know how to write it.
Will's arc and screentime centers someone else instead. Let's say his friends. In season 3, he feels distanced from them already. Dive into that. Them all having dating lives feelings isolating of him and he feels excluded when they bond over it, he worries they won't accept him or that things will change because he can't relate to them on this. Honestly, it could still even center Mike, just don't have him have feelings for him. Or make the feelings not in a somber, pining tone, but lighter, more centered on discovery and his reaction to what they mean for his relationship to himself - not "I have feelings for Mike so I want to be with him" but "I have feelings for Mike, that means I'm gay, my focus will be on grappling with that". Have him build to coming out, have THAT be the climax of his arc for him.
Robin's arc does not prioritize her screentime with Vickie. Robin's arc does not show her distraught over Tammy, having feelings for her for multiple season that cause her heartbreak and distress.
Robin's arc IS about acceptance. And you'll also notice that that is not "acceptance of the fact that she won't find romance as a queer person" jesus christ what the fuck. Even if there were no Vickie, it never involved that whatsoever. It was acceptance of the idea that she can find someone she is safe with.
Will's wouldn't even be an acceptance storyline, it would be so overshadowed by the message "accept!....that you have to settle for less sometimes when you're a minority" what the fuck?????
They did a queer acceptance storyline. She explicitly states it as her main desire in season 3. And they STILL gave her a love interest.
Will's arc looks nothing like Robin's. Because it isn't a queer acceptance storyline. He explicitly wants romance specifically in a way that Robin was never even established to.
If someone who didn't even mention wanting it and whose arc is about a different part entirely, and she STILL got it, then the person whose only thing he's ever wanted is it definitely will.
I genuinely cannot fathom the fact that they canonically wrote a queer arc that does not at all need romance and successfully conveyed beautiful messages of acceptance, but gave it romance anyways to elevate it and just be nice....but would also write a queer arc that absolutely requires romance then not provide it?
Robin's was NOT dependent on it and she got it. Will's IS dependent on it and he...won't?
The main point of this post is this:
Robin's is a self acceptance arc. They're written one in canon already, we know what one written by them looks like.
Will's looks nothing like hers.