Good point. Although even Michael Smith sparates them generally, just so he has an idea of how long any one batch is going to be in the developer since you can only turn the green light on toward the end of the development.

And back to the dust, the friend who introduced me to LF Way Back When carried a very small can of air and would blow the holders before inserting them. For whatever reason I have never felt the need to do that, but it served him well...I don't remember seeing him spend a lot of time spotting prints.