I just thought it'd be cool to make more use of enmity. Say there is a main tank tanking boss. An off tank tanking a couple of adds. And then two special adds that can't be tanked properly but still have an aggro bar. Kinda like fireball and iceball, you have to get hit by one then the other. So the DPS guys have to manage their aggro to not get killed and kind of switch aggro meters around. For example, a DRG just got hit by fireball. But iceball targeted the whm, and no the DRG has to steal aggro while whm stops heals, and other DPS will use this opportunity to attack other enemies.