I personally have a problem where I can never find anyone to do a weekly strike with, whether that's Nightfall or Heroic, I think that to should make them like any other strike where it searches for other people then you play with them.
This may be against the original idea where you have to play it with your friends or whatever but we don't all have a full friends list of people who have destiny.
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Just go into recruitment and look for people. IMO it's easier to look than to wait.