@allyrion: i will say why not, if the thief class was not in the way to come in the game. what will be the difference between the two class? the weapon used, the fact that thief can steal? this will be the same fast paced fighting class using side and behind attack.
that the whole point, they need to make each class feel different!
we are not asking for a combo system coming from the street fighter game, but that they deepen the one they have create for the monk.

other point you say, that you want to turn around the target and all, but that mostly a thing from solo game and is not possible to do it, since we have no frontal skill!