why? its usal in many games.
you dont have to see it like that you automatically get moved in a lobby but you stay in the lobby.
you are basically in the lobby the whole game and after it everyone is just still in it.
there could even be a feature that people can join a lobby that is playing right now.
and after a game is finished everyone can join and leav the lobby.
once you have set up a lobby you can do like 4 team games in 1-2 hrs