Because it's the truth. The majority of normal players will say "I already have enough HP for this or that so I don't need to use a cooldown here." Also, having so much HP makes it so you really don't even need cooldown for most things anyways, so people again get lazy and dont use them plus you have all that extra HP that could be damage if you were just using cooldown right in the first place. Also it doesn't matter who is closer to death (wtf?) When you aren't dead. Healers heal on, fight goes on.