BUNGIE, BUNGIE, BUNGIE...
You need to allow us to solo queue Sunless Cell on normal difficulty OR REMOVE THE "JOINING ALLIES" MECHANIC ENTIRELY so we can search for the collectables at our own pace!!!!
Every time I have loaded into this activity so far, one or both my fireteam members bomb through it as fast as they can, which leaves very little exploration time before the game "pulls me".
As it stands, it's either normal with a fireteam, or Grandmaster difficulty if you want to go in alone, and as much as I love GM's, I don't want to solo this brand new strike (to me, since I didn't play D1).
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You could load in on regular nightfall and just bump up the difficulty to expert as that too doesn't have match making, I know it's not a great solution but it works.