Just more content that bungie put out with out thinking about solo players, trying to do the new/ old dungeon solo is ridiculous. Raids even worse.. Wish more players would speak up about this. There's no reason solo players should have to grind so hard n get nothing for it. There's no reason bungie can't turn on match making for all there content.
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Watch a YouTube walkthrough and join or create a no-mic run of the dungeon if you don't want to interact. Problem solved. Then it's no different from a Vanguard Strike, except longer.