I'm not sure why the pessimism. When was the last time that something "controversial" like this happened with KHUX and SQEX didn't fix it or at least bribe us to silence our criticism with free jewels? Or they usually at least did not repeat the same mistake in the next similar event (i.e. look at Christmas weekend raid boss that got a lot of criticism vs. January's), even if that particular event or broken/unbalanced-as-fuck thing wasn't "fixed"
That said, I don't quite understand why they pushed Xemnas at this point. I mean, he's number one in Org XIII, shouldn't he have been the last one? At that point, almost a year from now, quests this hard wouldn't have been as much of a joke. Even a lot of F2P players should be able to do most of it by the end of 2017, especially if we ever get Brooms (which I'm starting to doubt...), but even without them, a year of active playing should put most in the position to be able to tackle far more of the Xemnas quests than is currently possible even for people like me who have spent some money on the game.
Btw, did SQEX silently make a pretty big QOL improvement to the way the game lists Friend medals before starting a quest? Seems like now it lists the medals in the order they were last used (at least the first few) instead of always shuffling the order whenever you begin a new quest or repeat something. A really nice improvement, especially when grinding raid bosses. No need to always search the long list of Friend medals for the one medal one repeatedly uses against a raid boss.