The issue nobody wants to address

[Welsper59]

That idea has actually been recently used in WoW, in the form of proving grounds. Basically it's an encounter where each of the 3 roles has a task to fulfill or they don't pass. Dps kill waves of enemies that don't hit back. Healers heal npc's who fight waves of enemies. Tanks fight waves of hard-hitting enemies while an npc heals them. Everyone has a timer. The only difference to your suggestion was that it's not a group dungeon, but a solo one. Why make other people wait around for that one person, after all. Proving grounds gates the WoW equivalent to DF expert dungeons, and to this day after a year the gating was introduced you can still read occasional complaints about how it's too hard.

Not going to lie. A version of PG would be amazing to have in this game. Not for the DF gating though, I don't care for that. But to test yourself by pushing up the difficulty of the encounter to earn achievements or items. For me, getting the highest dps achievement was one of the most memorable things of the latest WoW expansion.

It's on its way.

[Archaell]

It's on its way.

It will be interesting to see how that turns out.

Now if only it could also teach players a little bit of responsibility for their roles...