Proposal the embrace the green skin.

[AmiableApkallu]

I think Pnuema is a fantastic example. Its a button that does damage *and* heals! I wish it was a gain to use it, but I digress.

If it were a gain in single-target (as it already is in AoE), then I think I'd call it a badly designed button:

Do I push it on cooldown, for the damage, or do I hold it for when the heal is actually needed?

Attaching healing and damage both to a button works when incoming damage is more or less constant: the heal is likely to be useful, and the damage is always useful.