I do follow you about the DPS
And if he is complaining
I will remain him that raising him cost me less than 3 heal on him

...

But... In my own case i will never ever downgrade myself to a healing bot because the tank is LAZY !
I will pull out EVERY single trick and cooldown i have to stance dance DPS/heal
I expect at least for the tank to exploit some cooldown as possible.

If the tank pull 6+ mob and no CD... This is a serious waste of mana to heal him -,-
I'm a heal, not an evolved form of eos