Other FF titles were released on Day 1 on PC/Xbox. It’s over a year old and completely irrelevant for PS at this point. Also, maybe more people should have bought the game on PS5 instead of just parading it on social media for console warring, and maybe it would have stayed exclusive. PlayStation securing a full year of exclusivity should be celebrated by PS fans, not condemned, after knowing sales were not good enough.
Buddy, more than 3.4 million people did buy the game on PS5, and that was within the first couple of weeks. 1+ year out and the number's probably closer to 5 million. So we can stop with the disingenuous take that nobody bought the game; it's no one's fault but SE's expecting 10 million at launch for a game that was already divisive among the core fandom.
Besides, if anything Xbox is not the platform that will give any substantial additive in sales; that platform would be Steam. But likely even more so than Steam, would be the Switch. Unfortunately the Switch is too weak to run the game and Switch 2 is still at least six months away from release.
The only way Xbox can be of significance for XVI is through a Game Pass deal which almost guarantees no Xbox version until early 2025; SE wouldn't want to cut the legs out from a B2P Steam & EGS release right at the arrival of those two. They're going to milk XVI's multiplatform rollout as best they can.