Honestly before I started learning Japanese a few years ago I never consumed a huge amount of manga or anime but I always felt that Japanese media in general is just bad at pacing. I genuinely can’t think of a single piece of serialized Japanese media where I didn’t feel like you could cut 50% of the content and lose nothing. It seems that Japanese culture just loves that stuff? It may also be because of the way the publishing schedules work. If I understand correctly mangakas and animes basically have to keep outputting new chapters/episodes weekly or it’s game over?