We have no way to seek out other guardians for raids in game besides the 15 other people in the tower.
The truth is that if there were matchmaking for end game content people would finish it too quickly and then no longer be playing destiny. It's just another way to drag out the grind.
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If that's what they think they are terribly wrong, because they already set limits to what you can get weekly from Raids, Nightfall or Elders, so people will still continue to grind nevertheless. And this game doesn't really got a finish or an end, with exception of the lame campaign that took no longer than 5 hours to complete.