Over looking the simple math that there are less tank slots for a df party means they are weighed heavier in the in need calculation, only real competition is healers. Tanks are not as rare as people would think as far as df content goes. Irony is because people are more used to using tanks in party to get fast queues it works backward for void ark and tanks need 2+ dps for faster queues, as there is an excess of them vs available party slots in queue, healers still make out pretty good in there though.