So I was thinking why not bring back the BC unique dungeon sets of gear. Has a simple, yet cool, unique look to it, but it’s set bonuses would apply to M+ affixes. It could look like something like this:
2pc: your first death is not counted against the timer in a M+
4pc: volcanic, necrotic, etc, now hit you X% less
6pc: broken keys do not downgrade
Just some examples here, the idea was to separate dungeon gear from being the best source of raid gear while still having relevance.