They tried that system with WHM back in SB, and lilies were often considered the single worst job gauge in the game. They still act like that now, and those heals are still considered a last resort because they have to stop DPSing to use them.

As for healer DPS, so long as nobody is dying, why is them DPSing a problem? If they're shooting for bare minimum healing, good, that's what they should be doing, so long as nobody dies from lack of healing I fail to see any issues here.