Reason for not wanting it. Think if your trying to do a solid raid with friends and a random person drops in. Probably a sceeller like most match making things and he keeps on *dying and making you restart or someone you can't work with. Maybe even a person who hasn't done the raid before.
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I don't think the OP means active matchmaking, as in strikes that will add a player if someone drops. Match 6 players before starting, then it's function ceases. If someone drops, call in a friend or go back to orbit to match another.