Probably because the saga actually concluded and nearly every character got closure. KH is basically free to do whatever it wants now, and in my opinion, KH is at its highest when it does whatever it wants. Within reason, of course. I still want the focus to remain primarily on Sora, if only for the fact that I think he represents the spirit of the series best. Sora basically is a Disney character; he’s just more relatable and down to earth compared to someone like Mickey. If there’s anything I want KH to focus on more, it’s building the relationships between the characters. And I don’t just mean it in terms of plot, I want to see it in gameplay too.
Give us side stories, give us side quests, give us a good reason to visit worlds other than minigames and collectibles.