The problem that we have with warrior isn't that its not "technically" possible to main tank endgame (though from what I hear of b.coil it is there) its more over that both tanks are supposed to be roughly equal and its definitely not optimal. For a heal intensive fight I would never bring a warrior sorry. The heals generated require foresight, because there is no way you're going to be able to survive an oh sh** situation. Basically it boils down to having almost "no" emergency cds on a war imo.