AURF is not really meant to be balanced
I am not sure why the AURF hate to be honest. I am a huuuuuuuge proponent of proper game balance. But AURF is literally a mode made for total chaos and just messing around. Riot should not focus resources on making it balanced. It is not possible. At most, maybe give out bans in the mode? But I am fine with a random mess of champions, even when my team feeds 0/9/0, 0/11/0, 0/10/0 and my duo is crushing a lane until all five come to us with 30 kills on them at the 10-12 minute mark. It is just fun to play and see what you can do with the crazy stuff you get. The last thing I would want is the "balance" team touching it. It would be horribly unplayable and all of the fun would be gone in about two days.
just win the mode by themselves simply because they cannot be hit.