Disable Pick Intents From Ban List:

There are few things that frustrate me more than some selfish jerk banning my pick intent because they don't like my champion choice.

In a perfect world, people would naturally realize they don't get to decide other players' picks for them and that banning their teammate's main isn't going to improve their chances of winning. But since this isn't a perfect world, we need a system to prevent this kind of behavior. I get that this is already reportable under unsportsmanlike behavior, but reporting after the game doesn't do much to improve the negative experience and I think it shouldn't even be possible for them to do in the first place.

Here's my suggestion: In the ban selection screen, simply disable/gray-out any champions that are selected as pick intent by a teammate. There's little room for this to get in the way, because even if a teammate changes their mind about their pick, they can always update their pick intent before the ban timer runs out.