the thing about stranger things that is so weird to me and is a large reason that i think many people thought byler would happen is because, narratively, its kind of unsatisfying if it doesn't.
this isn't even on a plot point and chekovs gun and parallels level; im talking on an actual narrative level.
the thing about shows and books and movies that tend to cover the same age range that stranger things does is that they, like stranger things, usually add in some kind of romantic subplot. the kids at the forefront of this story are pre-teens turning into teenagers, and that age is rife with romantic complexities and dramas, as a general rule, both in fiction and in real life. in action and adventure, fantasy, or sci-fi media, of which stranger things falls under, romantic subplots are used to propel the plot forward and to develop characters and relationships that we, as viewers, fall in love with.
the thing about stranger things' romantic subplots and endgames that I found odd, was the way that none of these subplots are a "slowburn"; that is to say, none of these subplots are the product of years of build up and tension that only come to a head at the eleventh hour.
think of percabeth in the percy jackson and the olympians series, one of the most widely loved relationships maybe of all time. the pjo series takes place over the exact same age range that the main stranger things cast go through, from 12 to 16, and over those years, our main couple, percy and annabeth, develop a relationship in which they are both willing to sacrifice everything for each other before they finally get together after the final battle is over. their love story spans the entire first series and has it's ups and downs along with the plot of the series. critically, it is a slowburn, and this slow burn helps keep interest and add another layer of suspense along with the actual plot.
in stranger things, jopper, lumax, jancy, and rovickie, and mileven are the main couples that we see throughout the show.
none of these are even close to being a slowburn.
mileven kiss within a season, at twelve, and get together within two. jopper get together in season 4. jancy get together in season 2. lumax get together in season 2. rovickie get together sometime off-screen between seasons 4 and 5.
for the biggest show on netflix right now and one of the biggest pieces of media, period, for the past ten years, its downright weird that stranger things never put in that effort to add that narrative device and suspense and intrigue that a romantic slowburn subplot over the course of five seasons would provide. romantic slowburns dont just pull people in- they keep people hooked, and they add to the themes of the show.
the fact that every other couple in stranger things does not fit the criteria for a slowburn and that byler seemed to be ramping up in seasons three and four meant that it made sense for them to make byler canon. stranger things season five is messy and unfinished for a lot of reasons, but the fact that not a single couple in the show has a slow burn relationship that gets resolved just further adds to the feeling that this season is unfinished and creates a feeling of an unsatisfying final narrative