You're missing the constraints: what kinds of stories actually work for humans and can be told clearly, with mass appeal, in a 90-120 minute audio/visual format.

We already have spaces for broader or more experimental narratives, they're called novels. Music videos gave us popularized short form experimentation for a while. TV series give us longer form audio/visual storytelling. But there's a hard limit to how much complexity or diversity you can pack into a 90-120 minute block while still keeping it cohesive and broadly engaging. TV gets away with slower pacing and more meandering structures because viewers can dip in and out. People like/recommend a series even if one episode didn't keep their interest. If 30 minutes of a movie don't keep someone's interest they aren't going to recommend it, it sucks to spend 30 minutes in a theater detached from what you are watching. Movies have to convince audiences to stay locked in for the entire runtime, which naturally narrows the kind of stories that can work.

And part of the problem now is that movies were once novel. They evolved from stagey, non-gritty recorded plays basically to gritty, photorealistic stories. That leap kept things feeling fresh for a long time. But now that the tech curve has plateaued, now that dark/gritty has run it's course, it's like people want movies to somehow figure out how to be... not movies.

Punk was new/novel fresh. Then what was new/novel/fresh was identified and expanded upon. Then it become not new/novel/fresh. Other music genres were kept fresh by technical limitations slowly being removed by new tech/monetary limits limited who could do what/knowledge gatekeeping. Now that every tool is available to every person along with deeper knowledge of music theory, which theoretically should make it more interesting, music has gotten more boring. Because we don't want good. We want novel new experiences.