There is a difference between making old dungeon bosses into open world rares and scaling up an old, lame dungeon that's not even HD if you already have an updated version at hand. Shadowlands pre-event was a cheap whatever "event" while for Dragonflight, they return to "we give you a dungeon as a tease" way of MoP and WoD. They also said that Alex would send us to retrieve discs of Tyr during the pre-patch, which fit the name of the new wing aswell.
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Which is a good change tbh.