Riot has 3 bans not because of how many champions are in the game...
...but because of how many champions can be on each team.
...but because of how many champions can be on each team.
thats why 16 champs is the minimum to do rankd. incase your champs get all banned and pickd 3 bans per team = 6 champs and every other person is 9 champs. so no matter what is pickd and banned if u have 16 champs you will always have a champ. u can play ranked. if they changed it to 4 bans they would simply have to up the requirement to do ranked matches.