I’m willing to bet that the Blizzard QA team doesn’t really play World of Wacraft and probably tries to capture more conventional bugs like…do my abilities cast, can I walk through the world, can I sign in, etc.
Because there’s no way a QA team that actually plays the game would let the abomination that the Cooldown Manager is, go public. Or allow the Personal Resource Display to be deleted.
Blizzard needs to start hiring AddOn developers and I dunno, probably paying a group of world first raiders or something, to play the game. They would capture probably all the bugs and bad UI elements