Once again though, you're not looking at this from perspective other than the MMORPG-troupes, specifically the concept of "Damage Dealer" and "Tank" (when it really isn't that simple), which aren't the business of the developers, just MMO shorthand which is relatively meaningless in the game's actual design. When it comes to something being overpowered or broken- it isn't a matter usually a matter of game error, but of player error. The Devs shouldn't have sensitivities towards trying to making a 3 role party system, because that is a player choice on how to approach the game- not a mechanical process.