It's like you've read the first 50 pages of a 1000 page book and think you know what it's about...
If you don't know what you are talking about, then don't talk. You don't know FF14 endgame, so why are you talking about FF14 endgame? You don't know about FF14 mechanics, so why are you talking about FF14 mechanics? You don't know about FF14 rotations, so why are you talking about FF14 rotations?
The APM in WoW is WAAAAY higher than it is in FF14. You have more buttons to press in FF14 but the game in general is slower. You have more time to press those buttons. WoW and FF14 are very different games. FF14 combat with WoW bosses wouldn't be fun and WoW combat with FF14 bosses wouldn't be fun. But both games are fun because they are different and each combat system works with their own boss design.