People should stop asking for Perfect Balance for this game
Perfect balance is exactly what would kill the game.
When a perfect balance is achieved, then all changes stop happening, since the balance is here. Result? The game quickly becomes stales and and a point and click fight. Why? Because you lose all need to adapt.
This is precisely what Riot tries to do. Always a bit of imbalance towards a certain group or other, without being major. It is called Cyclical Imbalance and is a way for players to adapt to different metas and situations, and the ones better at it progress, while the stubborn ones are left behind. Evolution, in a certain sense.