Oh, well if you want to play that game, Warlocks got a DPS Caster legendary already since they had Atiesh, and Shadow Priests have never had one, since both their legendaries were for healing. So it's OUR turn now, not yours, and they should put on a class restriction not allowing Mages or Warlocks to roll on it. Following your logic, of course.
Or people can get over this pathetic competition and whining, stop being selfish and deal with the fact that they are possibly not going to be guaranteed to get this item at first if hybrids have higher attentance and play better than them. The same way hybrids are not guaranteed to get it over pure DPS classes. Oh no, it's fair, boo hoo!