Public areas for the friendship impaired would be great. Especially when a lot of people may not have either enough friends on at any given time or not enough who want to raid at all.
Update: If an area were created, then the matchmaking would be up to the players. Since you can only have friends with you for the raid, it would be on your shoulders to interview new people. You wouldn't want to send a friend invite, let alone embark on an extremely challenging mission with people who might be the turd in the punch bowl.
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I had this danger idea a while ago. you don't need an official area for this. Community consensus will do. Hangar area for crucible, perhaps. You can check out player stats. To communicate: Sit if you are in a party. Dance if you are looking for a party. Point to somebody to ask for an invite. Point back to accept. You don't even need chat!