I didn't say about RDM and Vercure what you seem to think I said. I've been pretty clear in this thread about the distinction between using Vercure properly and using it just because the RDM thinks they are supposed to be a healer.
Afflatus Misery and such don't belong in this discussion. DPS is literally everyone's job, and healing uptime is never required at 100%, so that remains an apples and oranges comparison. A healer using supporting DPS while healing is not required is doing their job properly, while a DPS has virtually nothing useful or necessary to do except DPS except in the event of emergency.
Sure, we could have a buffed Drain that healed significant HP, but I doubt it will happen. If anything I could see a Second Wind sort of skill for the ranged DPS role, but I've gone so long without one that I never thought about it until this thread popped up.