It's that the solo playlist is just window dressing. A cloy. Mostly meaningless. Because the best gear is still beyond reach for 99.9% of those who like play solo.
Again, just a backhanded slap at those of us who prefer to play alone.
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Pretty sure the solo ops playlist will offer up to Tier 5 loot. Some items are exclusive to certain playlists but that is just a given. But I doubt there isn't some good gear from the solo ops playlist.