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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I don't think it needs a specific version for this - the issue is that it's a requirement for two things right now; the osseous fragments and the intrinsic unlock, and the first one you want to take your time with, the second you just want to bomb through it. You can still grab the fragments in more than one run, and you might just be lucky enough to get teammates like the two I got last night (where one of them actually figured out I was going for the fragments and messaged me to go back because I'd missed a couple, even showing me where they were). If you're still insisting on soloing it you can always use the 'clock trick' on PC and PS, or the 'burner account' trick on Xbox to load into matchmade activities all by yourself.