Kingdom Hearts has always been Disney/Final Fantasy + Original story and that's why people loved/love this series. The problem is that while KH1 was perfectly balanced, the others were not. Starting from KH2, Disney started being filler, while FF started slowly fading. With KH3, Disney seems to have gained plot importance again, although with pace problems, but FF is nowhere to be seen, so it's still unbalanced (but imo still better than KH2). They need to find that balance again, it's all they have to do. Kingdom Hearts never was and should never be another generic JRPG or another Disney game. It needs to be a game where you defeat Sephiroth alongside Donald and Goofy before going to save the universe from an anime villain. And you don't blink an eye while playing because, one way or another, it all makes sense.