There's a difference between having no effect whatsoever and making tanks the most played Role in game. Yes your point has validity, however the fact that Tanks and healers have the least options both conceptually and mechanically doesn't help the situation whatsoever. People have all sorts of irrational ties to classes, I mean how many people are consistantly requesting a "PURE DPS" bow class? A Tank class that feels different than the current set won't make tanks the most common role, but it might cut DPS cues down a couple minutes.