iirc, Ragnarok online and the incoming Tree of Savior are using the trinity system, and have (somewhat) balanced PvP because the OP aspects of some jobs get flooded in the mass of players. Can't have this here because the PvP isn't exactly "massive" (even though the 72 man seal rock can be a joyous clusterfuck of light and sparkles), but the trinity CAN do things even when individual balance is out of whack.