The issue between FF14 and other game isn't just a matter of degrees. It's something versus nothing at all. Turn autorun on and start casting your 'mount chocobo' spell. You'll see that the spell obviously attempts to be cast and depending on your lag and time of the day it might even claim to finish. It'll certain go on for at least 0.5s or so in the vast majority of the time.

Now go to WoW or any other MMORPG, put autorun on and try to get on your mount. I'll be shocked if the game even displays the casting timer at all (unless you managed to accidentally ran into something and got stuck). You should just get 'can't do that' 100% of the time. This is obviously because FF14 chose to handle this issue totally differently, unless WoW and every other MMORPG has managed to invent teleportation of data, which is what is necessary to ensure the castbar never even starts at all if they operated under the same architecture as FF14.