The Mists of Pandaria challenge mode sets are one of the best looking sets in the game to date period. I earned Realm first Challenge modes Gold on the Emeriss server back at the start of MoP.
I am maining a paladin now and not being able to wear that awesome transmog when I have the achievement is just creating a bad and sad moment for me. And legit, the actual pieces of the gear are still in the Vales of Endless springs vendor, they are just labeled as locked.
My ask is make them obtainable for people who at least have the achievement so we can just buy it off the vendor. There is no need to have awesome stuff created in your world, and we the players not be able to connect with them, for no reason, only losing precious game content.
So either the above or as a final note - In Dragonflight , add like a content type like a new Mage tower challenge type in one of the patches and make the sets the reward or something.
I beg Blizzard, find reason.
All the best.