Why would they add any in after we are done with the zone? Just like any other patch added zone once we move on to 8.3 these zones will be a footnote.
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Max level zone gets a max level dungeon. It is like people are left out there. I am sure in a future patch they will chop it in hald to make it a mythic plus and heroic dungeon also. Mythic 0 dungeons are in no way lomiting to people beyond needing to be at level cap.