Edit: Will you read the freaking post? Nowhere in it am I advocating for more specs. This has nothing to do with current class/spec balance. Jeez man come on.
Then I've got a game for you all.
Think of a gameplay or Warcraft lore archetype that has not been covered by one of the current World of Warcraft classes in any version of the game.
Whatever it is you post, the next person will try to debunk it, followed by their own idea. So on and so forth, with this we will hopefully get a better look at what exactly World of Warcraft hasn't done with their classes. Or it will devolve into a Sylvanas thread but I'm willing to take that risk!
I'll start:
A battlefield medic that uses first aid, alchemy and strategic positioning to support allies. Strong spot healing and HOTs at the cost of lower range, versatile support toolkit with middling mobility.
Whether it's a shite example or not, I don't think we see this in today's game. Now prove me wrong!