With the launch of dungeon layers: it as a missed opportunity to rework selected dungeons. I can Imagine how cool It would be to complete a seasonal title by completing demanding dungeons. (I would also like to see their legacy variant as an option too, so if there's a one of a kind roll someone wants they can do that; Do the same thing with raids ).
Hare's a list of dungeons I'd like to see reworked:
Warlords ruin
Sundered Doctrine
Grasp Of Avarice
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Don't forget weapons and armor should also be set in "new content" levels(Tiers).