That is one of biggest problem of world of warcraft.. Create amazing contents like mage tower or class halls to next expansion they ignored, almost deleted content.
IDK why they dont improve some of those contents. Garrisons for example they let it too much self sufficient and garrisons was abbandoned like half wod content by blizzard.
Housing is a system that sould be only cosmetic or some content exclusive like toy farm, pet.. Make an armory room to old trophies like frostmourn exposure, just an example here.
Why the necessity of making new worlds when some maps from azeroth isnt acessible since classic? So many azeroth history to been told and explore, why the fuck we need face gods and kill gods of those gods!
Why not update some key azeroth maps to players feel time skip in game world?!