The issue is that blizzard cannot balance classes right now and when they add " utility " some classes ( DH ) became mandatory.
If blizzard decide to make let's say, Elemental Shaman bring a debuff that increase Spell Critical DMG, you can bet you ass they will start to appears in raid.
I would bring back some utility buff/debuffs from TBC for specific spec and other from MoP/WoD