One of the worse feelings is when you are hyped to play your main or whatever you eant to play,you pick him and your mid laner bans him and sends this ";)", neither your champion is his counter. When that happens to my I am tilted before even game started. I just don't know why is it fun fir people to do that. Let's say your trammate is otp Katarina and has 90% winrate on her and great stats and bot laner finds it funny to ban Katarina so teammate needs to play someone other but she isn't that skilled as with Katarina. If you ban teammates pick you have higher chance to lose game (either banned guy will troll or just not be as good as with his banned champion. So if riot could come up to some punishment or report option for banning picked champion.