Looks like Allied Races are once again only a one expansion feature, they couldn't even bother to give them any new cosmetic appearances in the barbershop, so why would they waste their time and resources on adding a few odd Mole Machine locations on Zuldazar and Kul'tiras for the Dark Irons.
what a shame, with each passing expansion Blizzard misses more and more opportunities to make the right choices for their players.