Go on twitch and watch the streams. These encounters are very difficult. I've watched multiple channels completely wipe, multiple times. Matchmaking for a raid would be useless. A group of people not communicating wouldn't make it past the first boss.
Bungie knew what they were doing. Raids are highly challenging and will require constant communication and teamwork. Not to mention every person has to learn all the mechanics. Bungie made the right decision.
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Actually I'm fairly sure the reason there is t any matchmaking is because the progression save is tied to the fire team leader.