Depends on if, and how big, the potential ability prune that the dev team is considering in 4.0 is. If classes are robbed of half or more of their abilities, then yeah, the global is just gonna be positively glacial. FWIW, there IS no "thinking" about your next move in a rotation-based game like this...there's not a whole lot of procs or whatnot that you have to be on the lookout for or could mess up if the GCD was faster.

On the other hand, I know something like this would be a massive undertaking for the dev team, and extremely difficult for controller players and whatnot to get used to, so I don't really care if they change it or not. Faster globals work in other games by design; trying to retrofit it to XIV, a game admittedly programmed with things like a 3-second server sync for DoT ticks and whatnot, would probably be more trouble than it's worth. Redoing some low level gameplay so that it doesn't suck so bad would definitely help, though. I had to laugh at the person who said they've "never" seen anyone complain about XIV's global when trying the game out - do you never visit r/MMORPG? That's pretty much the biggest complaint there (note that the game is still positively received overall).