Autofill is Crap
I thought the game evolved past this. I don't care if I have to wait an extra ten minutes to get in a game. Auto fill does nothing to protect the so called integrity of match making. It just forces players into a position (support cough) they don't want to play. It just creates additional toxicity among players. Players who off pick because they aren't familiar with the support role. Others who outright refuse to support because it isn't what they want and they'd rather sabotage the game and waste twenty or more minutes of the players' time.
Time saved in queue is time wasted in game.