Long ago, there was an attempt to balance QM by role. I always opposed it, but it went through anyway, and now it’s almost impossible to find a QM game with a combination of Abathur/Medivh/Zarya.
There have been a lot of changes since then, such as removing Tassadar from the Support role so he’s not on that list, but it’s pretty clear that the restrictions still exist (when was the last time you saw a clone Medivh throwing portals everywhere?). I don’t understand why, but if they are going to continue, there’s no reason that Deathwing should not be added to the list. Aba+Medivh, or Aba+Zarya, are both clearly better pairings than Aba+Deathwing, a character that can’t get a hat, and can’t be an Ultimate Evolution.
I’d prefer to just remove the QM Support role restrictions, but if we’re going to keep them, please add Deathwing to the list.