How is this fair for DRK?

[RyuDragnier]

I mean, that's kinda the point. People are complaining about DRK dungeon heals when you've got abyssal up for every mob group and can put up a 25 % shield every 15 seconds.
There hasn't been a problem with DRK survivability in dungeons since day 1 but for some reason people just can't shut up about it.

Because if DPS are bad, the DRK runs out of mitigation before the enemies die. If the healer is bad, the DRK has no way to sustain themselves enough to make up for it.

If you're on WAR, Bloodwhetting and Equilibrium help massively for this.
If you're on PLD, Holy Circle, emergency Clemency, Holy Shelltron help with this.
If you're on GNB, Aurura, HoC help with this.
If you're on DRK, you only have Abyssal Drain, then nothing.

That's the main complaint, that when things get bad, DRK has no way to keep itself afloat compared to the other tanks. Not even its "invuln" can buy time, since it's the one that punishes you the worst since you need a healer to full heal you.