That's literally asking SE to completely change how enmity works, on top of asking for what you are asking for. Enmity is partially based on how much damage is done. I don't know the exact math on it but I imagine it would probably be something along the lines of:

base enmity generation + % of damage done

Never mind the fact that the entire reason your healing is so "not fun" as described is because you still can't keep dark knights alive during wall to wall dungeon pulls to save your life when said healing is actually required, proving to Square Enix that it's still not safe to nerf warrior.