The Big Army is trying to change that
1SGs don't have nearly as much admin stuff to do as they used to and they are, in theory, the most experienced NCOs in the Battery, Company or Troop.
Somebody had the bright idea that that talent and slack time could be put to good use if the 1SG became the senior trainer for the unit. It's taking hold slowly, I think. Thus, for the 1SG to wander about during operations makes sense. All will not do that job well but most will. Same applies to an extent to the CSM position; a lot of practical and tactical knowledge there (or should be...), shame to not put it to use now and then. Like anything else, a little common sense must be exercised -- and a lot of non-interference with others jobs is required.
Other'n that, I agree with your comment