Hmmm. Interesting ideas. I've been playing some Bozja and HoH recently, largely because what else is there to do.

In deep dungeons specifically, I see your point about the PvE kit being a bit incongruent with the engagements. I usually run WAR and MCH which are my PvE mains, and PCT because it's sort of OP. I hadn't been conscious of the main point you raise, but I think what I'm doing in practice is basically using a subset of the PvE kit (already trimmed by level cap). Standard PvE rotations/openers are pretty much irrelevant, as you say.

Agreed developing DD-specific kits is likely not the answer, which is why I mentioned Bozja. Maybe the way to make DDs feel more unique is to incorporate something like Lost Actions? The pomanders sort of work like essences, so it wouldn't be a huge lift for the devs since they have the framework already.