Any true hardcore gamer is going to do what he can within the limits of the game he or she chooses not demand the game changes to suit their whim. Sure, it'd be a nice addition, but it isn't a necessity.
One word: Addons
They mod the playstyle of the game and some healers DO rely too heavily on crap like "Healbot". However this is acceptable and dual targets is not? I'm sorry but that seems a bit hypocritical.