I find it sad Blizzard won't add things that are "bugs" in private servers. For example wand speed is increased by quivers in a lot of private servers but it was not a thing in vanilla. Many are used to these "bugs" and getting rid of these is a slap to the face.
As private servers are de facto the correct version of vanilla nowadays because thats what people are used now, I think Blizzard should bring some of these features to the Classic version of WoW.