QoL suggestion for retail,
I think it would be really neat to have an NPC (similar to the ones that put you into the LFR versions of legacy raids) that allow you to “queue” into an instance of any legacy raid with your party or solo, and you can choose the difficulty at this NPC too. Except it would have access to all of the raids in the xpac available. So maybe one in each major city from the respected xpac?
This would streamline the legacy raid farming portion of the game and remove the prereq grind to unlock the portals or even easy access to certain raids. Sanctum of Domination comes to mind, if you don’t have the Maw intro done or have progressed to the point that you don’t get horrified and killed on your way to the raid. I feel heavily deterred to run certain legacy content just because it’s a pain to get there.
Maybe this NPC could be a part of player housing or unlocked via a quest chain? There could also be a pre-requisite that requires you to have cleared the raid/difficulty before you’re able to “quick-queue” with the NPC. I think this would add an immense amount of QoL to those who still enjoy legacy farming in retail.