Unblanced or OP or broken champions are unfair to everyone, including the mains

Vayne being banned half the games. Its unfair to one team if the other has her, and its unfair to mains who liked that champ for years, and now have a hard time playing her due to her high ban rate.

Literally everyone loses when Riot refuses to address such champions.

I still want to know what metrics Riot uses to decide if changes are moving the game into a more balanced state. They never told us, so for all we know, changes are based on feelings and egos.