Dungeon armor would be a farmable commodity if you got a damage resistance buff by wearing 4x the armor, in the dungeon, when running solo. Imagine the farming you would need to do to try and get good stats on that armor! Then use it to help get you through a solo flawless run. It's a perfect idea, but has never been implemented, outside of raid armor.... Which requires you use mods on top of getting raid armor with good stats... And the raid armor mods are kind of weak to begin with.