For DLC dungeons we got DPS checks and tank checks (You can not block elite adds dmg in vet DLC with a lightning staff in light armor and survive)
But... Very rarely there's a healing check in dungeons.
I think this is a big mistake on the parts of ZoS and is one of the reasons the 3dd run is so prevelant.
By sparing the healer role any significant stress they're also essentially dooming it in the long run.
I suggest healing checks in certain parts of dungeons like a nasty un-cleansable poison cloud, bleed or burn being applied to the team.
DD's could theoreticly try to self heal it, but the dmg on them should be so strong, they would burn through their entire ressource pool trying to stay alive - essentially turning their DPS to near zero.
It would require healers to be on point stacking HoTs on the team, and being on point with combat prayer or other burst heals. No one-shots in these parts just strong, sustained dmg on the team, while the team is getting zerged by low damage cannon fodder that would overwhelm the team if DPS doesn't get rid of them - while the DOT on the players persist - Basicly let good healers shine and show they can do more than spamming regen every 10 seconds.
I think healing checks like these would not only get healers back on the map but also valued if they could perform well in their core role (other than being an armor set mule)