WoW is nowhere harder than any other MMORPGs. It's twitchier, but twitch is not a measure of difficulty.
No, WoW can be just as hard as any other game. The problem here is that these situations are so few and far between that it doesn't really matter. For people looking for a challenge, MMORPG's are not really a good option. The developers should focus on making the gameplay mechanics fun and flexible instead of controlling the game so that challenging content can be made. WoW for example sacrifices player freedom so that it can control the players better and create more challenging content. I don't think this is necessary and that XIV can go much further with freedom. The developers have less control over content but who cares. The upside is worth it.