It does not take 9 years to balance a single game with a single map.
I don't know why you people are still here hoping the game will magically stop being shit. Riot has a live design team, they get paid salaries. If they actually did their job and fixed the game then they would lose their purpose. Think of it, what medicine found a cure for cancer, they would think twice about releasing it since cancer treatment is such a lucrative business. Balance time has taken us for a good ride for 9 years, creating problems where there were none, then winning a bit of your trust back by "fixing it".
IMO the game was as closed to perfectly balanced as possible in Season 4. Since then they've been changing for the sake of change to keep their jobs. Once again it does not take 9 years to balance a game when there is a dedicated balance TEAM working 9-5 just to balance. The ruse is over, stop giving these guys your money and play literally any other game.