Why are there only 6 bans again?

With the plethora of oppressive champions that riot has put in the game, it gets old basically seeing the same ones every game. Bans are pretty universal, then the next 4 picks are usually universal. Literally every game is the same team composition from game to game, until a new patch comes out. Then the next set of flavor of the month champions are shuffled into the mix.

Why are there only 6 champion bans? In a game with so many possible picks, there must be more bans allowed. Honestly I think 12 bans is fair, but at the minimum there should be 10.

Otherwise, the new queue system is by far the best idea riot has had in a long time. (Though two years ago, when I first started playing, it took a total of 2 weeks to come up with this concept and wonder why this wasn't implemented from day one)