Yeah, try not to take anything the KH fandom does or says very seriously or personally, trust me when I say that unless you're one of the KH content creators on youtube, the fandom will hate itself, you, and everyone else, it's really disjointed especially because half the fandom hates basically any other game in the series that isn't KH2 because they can't take their nostalgia glasses off.
As for the story, as I said, it has its flaws for sure, but I think Mr. Nomura knew a little bit of where he wanted his story to go in each game. I also think each original version of each game releasing on different consoles had something to do with the company's own choices and not necessarily his own. I think he also wrote and released games in the order that he did because he wasn't sure how each entry was going to do, all of which led to a seemingly sloppy execution of his story. I personally feel like this because when one plays all the games in chronological order and all on the same console, they make sense and fit together really well.