I'd like to think most would be more understanding of why it taking Kingdom Hearts IV longer than past titles if they just watched Masahiro Sakurai youtube channel on game development, especially since he had to go through a lot of the same issues on the Super Smash Bros. series.

Three years isn't even that long either, considering everything their having to do for it too, like making the game in a new game engine and giving it a whole new graphical redesign from the rest of the series. Like this stuff take time, and they have to do a serious amount work for it.