This is just a casual observation from looking at many home improvement shows: When pros drive in a screw with a power tool, they often "jig" the trigger quickly full on and off as they finish setting the screw instead of just letting off on the trigger slowly taking advantage of the VS built into virtually all drills and impact drivers. Doesn't look any faster to me. Is that just how "pros" do it? It just kind of bugs me as it makes no sense. Am I missing something? Do I need to change my technique?