What Healer kit (not encounter) change would make GCD heals NOT bad gameplay?

[Aravell]

So how does moving damage from the nuke to the dot help such players out or make all those GCD heals used not a punishment?

The original question you asked was how to make GCD heals less bad to use, that's one of the ways to make it less bad to use. DoTs being a higher percentage of your damage means you don't lose as much damage if you opt to GCD heal instead of using your GCD nuke because the DoT is still ticking in the background while you spend that GCD on a heal. You didn't mention in your original post that any suggestions have to take into account people who don't use DoTs at all so I don't know why you made that a condition now.