It's also an issue with how the game functions. WoW can get away with a random order of mechanics and split second movement because the hit detection updates basically in real time whereas in XIV you are heavily reliant on the server ticks, an invisible timer that determines whether or not you were standing in something by the time it updates.

Even within this system there is some kind of unreliability, let's call them "slow instances". Have you ever been in a fight you've done 10, 20, maybe 39 times but on the 40th you perform the exact same movements as before but suddenly get hit?