i could prove you wrong by going into LFG and then AFK :D if people want to ruin your game they will find a way , regardless if matchmaking is available by some peoples agains matchmaking logic all planes should stop flying to prevent a potential terrorist attack

But in lfg you would then have a fireteam leader, or a vote to kick system, in order to avoid this.

well , votekick and party leader kick can be also abused , i know from other games , even i this game where they kick you before rewards , it may be considered even worse than a afk player for some