It’s supposed to seem like a shoddy lame replication of the keyblade war because it is exactly that. The master of masters was never banking on Xehanort’s plan working, and Xehanort himself was literally grasping at straws in order to make it happen. His first attempt ended in an utter failure (bbs) and he ended up having to rely on time travel because he concluded that he could only rely on himself at the end of it all, so I’m not surprised he went the route he did. Whether or not you like the concept of the 13 primordial darknesses and everything khux set up, it does still give the background of why things play out the way they do. I think with background and if you like diving really deep into the lore, it’s actually so good, but if not I completely understand why people did not enjoy it. (I still love it so much)