Dumb "balance" decision
Nice of you to gut a mid mage sitting at 48% winrate for no good reason other than to water her down because "pros" use her. I'm sure it was convenient for you to forget that the pros make up an tiny portion of your player base.
And your excuse that she was good at waveclear is absolutely piss poor. That was just part of her kit. You don't hear anyone saying Jinx should be watered down because she's good at doing ranged auto damage. Nor do you hear anyone saying Chogath should be watered down because he has lots of health and CC. It's part of their kit and you coming in and homogenizing a champion arbitrarily, while calling it "balance," does not constitute genuine work for your balance team.