I don't know that we'll ever quite purge jazz from my stuff completely. I tried to keep it somber from what I'd known in the Super Famicom era in the early to mid 90's. Kingdom Hearts is long after my physical console days
Yo, never do that. We are supposed to learn new stuff, not forget it.
Even pure jazz has its place in scoring (ever heard of Cowboy Bebop?). Don't ever try to fight it, rather grow from it.