Generally, children want to play with children, and adults want to play with adults.
Why not allow us to split ourselves up beforehand?
Imagine how much less work the tribunal would be if people would rarely enter games with someone who is playing the game with an entirely different purpose? The younger players who don't want to be told what to do can play with others who don't want to be told what to do. The older players who just want to have an organized team game can play with players who also want to have an organized team game.
This really seems like a win-win to me.