It's set in a fantasy universe. We're talking about a world where things like resurrecting the dead, teleportation, and conjuring food/water out of thin air are normal. One thing I really like about WoW is the fact that pretty much anything can "belong" there.
Thats pretty vague way to say everything in this thread should belong to the game.
There are differenes between universes. There are story elements that should limit the things that are possible.
Does sci-fi like elements belong in fantasy? For example whole outland and goblin/gnome steampunk tech sounds quite high tech for fantasy sometimes. I dont mind myself but thats one thing people talk about.
Magical teleporation is different, story- and element-wise, than lets say having pocketwatch that has so much tech in it it can throw you across the world and even into other planets.