Good points all! I'll think about it a bit more, probably make it an optional thing to participate in, and maybe only occasionally for certain posts or situations where more info behind the scenes might help greatly in moving plot -- but not always in a direction you'd expect. The primary inspiration here is in-person tabletop, where the GM and players have the opportunity to clarify with one another what's happening and why, after the narrative has been told.

It seems, as has been indicated, that it's the kind of thing that'd need to be put in practice before it can be judged too much. We'll try it a little to begin with, and expand or quit according to what feels right. :D