Like 1/3rd the champ pool is ban worthy

It's not THAT bad, you are exaggerating. The game is not in a great place right now, especially in contrast to just before Sated how balanced it was. But even right now it's maybe a dozen sated junglers, plus the juggernauts that need banning. Ideally nothing needs to be banned and it is purely focused around what would counter your team.

But, it's not like that's reasonable to maintain for any period of time with how Riot approaches adding to the game. I don't think that Riot will ever be done adding stuff to the game, which means they will never be done trying to balance all the additions and changes they made.