Difference in manga/anime culture too. Western animation/cartoon seems to have style that target specific audiences. You got kids and teenage cartoons. Then you got family friendly to adult cartoons ranging from Simpsons, King of the Hill, to Family Guy and South Park. Then you got superhero cartoons that target the teenage and adult comic fans. At least that’s how I see it.

Manga/anime has its own subgenres and target audience quite different from western cartoons. You got Shonen stuff that targets the kids to young adults, mostly men. Then shoujo for the girls. Seinan and the equivalent of it for women which targets an older audience. However within these genres there’s also subgenres like racing manga, gambling manga, supernatural, fantasy, isekai, mecha, etc. From my own observations, I think Japanese anime/manga covers a wider range of subjects.

Im guessing you mean JJK? I think that might be because Mappa is overworking their animators.