I like the idea of movies like the Demon Slayer movie adapting entire arcs into a film rather than an arc that's like 5 or 6 episodes, I think the problem with a lot of anime movies is that they're mostly non-canon to the main story of an anime, One Piece has like 20 movies and I'm pretty sure none of them are canon. My Hero Academia does it different cuz I believe the first movie is non-canon, but some of the events and characters exist in the canon universe, and I believe the second movie is entirely canon (please feel free to correct me if I'm wrong, I haven't seen the second movie).