pristine realms should have happenedAnd the lesson they learned is to allow multiple difficulties. And it works. The only content that lacks multiple difficulties is the over world.
Call me old fashioned but I think an RPG, the persistent world the game is at is supposed to be the BIGGEST feature of it.
I've said it before, add a toggle like War Mode that turns the world SAVAGE™. Tie into it some spec specific passives that tune up classes so they are all closer together when it comes to soloing instead of the massive outliers that exist now. BOOM challenging solo content