An arguement towards having Healing on DPS

[Archwizard]

OP's saying what I've been saying for a month now.

Sure, Drain as it was in SB was crap, nobody's disputing that -- literally every time the mention of returning Drain to BLM comes up, the word "buffed" is liberally sprinkled in.
"But they could have just buffed it before!" Not really, when you remember it was a role action available to leveling ACNs and Ruin was only 20 potency higher. Limiting it to one job is the best thing that could ever happen to Drain.
We don't even want it to be something to replace having a healer, we just want something to sustain ourselves when we don't have a pocket healer.

every other DPS in the game don't have a huge shield they can pop like BLM

No you're right, just SMN and (iirc) a couple DoWs.
Who also have heals.

And I mean c'mon, RDMs jump into melee, I wouldn't be surprised if they get one next Xpac.

There's nothing wrong with non-healers having an emergency heal, but you only need to look at how many RDMs stop doing their actual jobs in favor of trying to do the healer's job to see what happens when we give DPS access to viable, on-demand healing.

K mate I'm gonna have to get real with you for a minute: How often have you actually seen that?

Because I literally never have, and as a RDM main I'm constantly looking at other RDMs I party with to see how I compare.
Throughout Stormblood I've seen one RDM do a rotation of fullcast VAero -> dual VThunder -> fullcast VStone -> dual VFire, and I've seen a handful use Scatter in single-target.
I've even encountered one who claimed they couldn't cast Verraise 'cuz Swiftcast was on CD.

What I've never seen is a RDM drop everything to Vercure the tanks and other DPS during a bossfight, unless either the healers were down/recovering/useless (where I've been that guy), or they needed a Dualcast proc.
So if you've seen that more than like, twice? Then you're probably consistently grouping with some bad players. On the whole, most of the RDM players I meet tend to at least understand that their role is to kill things, given the big red sword icon that comes up when they queue for anything.

Furthermore: Your argument only carries over to not allowing Physick to be Int-based to prevent them from doing the healer's job, not to disallowing BLMs to self-heal (hell, you yourself said "nothing wrong with non-healers having emergency heals").
Also also: Your argument is at the precipice of a slippery slope. The same logic could be applied to removing barrier skills from DPS since they don't tank, for instance, and would serve to fortify arguments against returning Apocatastasis and Erase to casters.