I love it when people reply to these kinds of threads citing efficiency.

It's true, KB+M IS more efficient in terms of how quickly you have access to stuff.

The thing is, though, there is no instance or fight that requires split second, frame perfect reflexes. Anything that you have to outright react to gives you ample time to do so, with the rest being up to individual player skill. That said, this is not a fighting game. You're not doing an FADC-into-ultra or kara cancelling. This game just doesn't demand such dexterity.

Of course, I know that me saying that is kinda pointless. This IS an MMO, after all, a genre known for its OCD levels of perfectionism. People will go "I do this cause it optimizes #s by XXX% TO THE MAX!" in a game that just isn't that demanding.