Okay the prove:
While the big movie producing industries like hollywood or the very original pajeed equivalent bollywood have very high costs for their movies, the production cost for animes is rather small in comparisson and the story (in most cases) is based on a successful manga.
What does that mean?
It means that hollywood NEEDS to make a lot of money to even go even, which means they need to rely on existing strategies that worked already, so the chance that the viewer likes the movie is maximized. They mustnt experiment because they'd lose millions.
With anime on the other hand it's the exact opposite.There are a lot of different more or less successful mangaka, who all try to be different in some way, because everything that is trendy will never really be successful or viewed as a piece of some kind of art. Mangaka need to experiment and build something new and original from their fantasy, or alternativley they just drop some moetrash that nobody watches anymore 1 year after release. Of course they exist as well, but that behavior is the norm in f.e. hollywood.
Every movie feels like a different movie just with a different skin. >90% of the new movies follow the same storyline and just have a some small adjustments.