The activity is no longer as difficult as when it launched so there is no real reason for there not to have matchmaking for this activity. There are a handful of times where I ran heroic and I got booted right before opening the final chest. Other times the fireteam leader may quickly return to orbit without everyone getting loot. While this happens rarely, it is very frustrating nevertheless.
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Honestly, why not have matchmaking for every activity? If people want to try their hand at something with a PUG, why not? Give an ETA like other MMO’s do.