Riot's balance team has no idea about balancing the game, I have been watching the twitter of some members and they actually play everything but league of legends, and we, the players, pay for their negligence. I'm pretty sure even a random group of high elo players will work better and faster, and I'm sure a lot of people will like to work there, so there's no point on having someone that doesn't know how to do his job right. They also never admit mistakes and they dont take any feedback from the community, no matter how gamebreaking the rework/change they did is, they'll almost never go back and admit they failed, they just let some champs die and with them a part of the community.