A type of content i wish we had more, is related to the warcraft games, from1 to 3. I wish we would have more content from that game as locations (with this i mean how they actualy look on those games), or more easter eggs or miny stories related to the games. The main reason i started to play wow was to see the universe after warcraft 3. And we do have quite alot of those, a few that comes into my mind fast:
-in wacraft 3 naisha and a dew of her sisters sacrifice themselfs in tomb of sdargeras, we have them in the raids now
- frostmourne cavern where you find out muradin is alive and see arthas old hammer
-Stratholme and those timewalking dungeons with old stories from w3 like the hijal battle
-uther tomb (or monument?)
-arthas kiling his father in throne room echo
-the story where you get the race transmog for the blood elves showing arthas march over silvermoon, in this one, in that area, make me see the altars where the parts of the key of the free moons where placed or add more of the locations from that campain maybe some small questlines, make me wish to go back to those zones
In blood elves campain kaelthas repair some observatories, let me go to those, see them, the horde cut up some crazy amount of wood in the campain from ashevale (10k wood if remember corectly that was the amount) let me see the part of ashenvale who is scared, or some ancients who are dead or corpses (they did kill some of those when they saw how much they give). Or let me see the tomb where artgas raised kelthuzad (by the way till the war within i never knew he was an actual archmage in dalaran GIVE ME MORE STORIES LIKE THAT), or show me how he got to be a bloody necromancer, let me visit the caves were jaina thrall and mediv stood when they planed to unite all the races vs the legion and so on, theyre is so much potential to be added in the old zones, to be relevant again and its wasted. New zones are cool, they look good they are nice, but il like more content like this from the past in the old zones, to have a reason to visit them again, wow is big, and the world is super fun and nice, but 90% of players are in the zones of the curent expansions and have no reason to go to the old ones except to enter old raids or dungeons to farm them. I just wish i had more content like that