Please add harder or more varied dungeons other than deep dungeon

[cynical_baby]

I'm quite sure they said they would add hard 4-man content other than dungeons, and then announced that the later floors of deep dungeon were meant for this in the live letter.

They were indeed talking about harder dungeons in a live letter. They said that they design the dungeons hard and then nerf some mechanics, so more casual players could get through easier. One example they brought was Saint Mocianne's Arboretum where the first boss had the adds also circle around in the first design. But if was to hard for casual players, so they nerfed the adds.
I would like to have these hard dungeons get even harder (savage/ex difficulty) so 4-men groups could also have some high-end content.