Might have something to do with the small slide stop lever on the Glock and other polymer pistols. I think the small vs large motor skills is a crock frankly, used by instructors to justify their thoughts. How it is more difficult to push the slide stop down with your thumb then it is to reach over and give the slide stop a tug is beyond me. Using terms like large and small motor skills sure is a nice sound bite though. Kind of suggests the instructor has a physio/medical background doesn't it.
Take Care
Bob
Some of the techniques being taught at some schools haven't got a lot to do with competition/IPSC/range type environments. Some schools are taught by people who have actually been in high stress situations on a regular basis. Courses taught by a fellow shooter Jim Cirillo RIP, come to mind. These techniques have speed as a by-product of consistent proper life saving drills, and as mentioned, some of the drills are done with sweat, external atmospheric moisture and various other less than ideal impact agents being introduced including blood from a variety of sources.
Some of these drills include the unload, loading including magazine changes and slide manipulation with gun hand only and then with support hand only. Most recreational shooters need not practice or master these drills, but for Sh & gigs, why not.
Many, many tests and drills have been conducted and are continually studied as to the effects of stress and the loss of fine motor skills. Note, as per others on here who mis-quoted myself, I have not called these small or large motor skills.
These same studies have been carried out not only by various shooting academia, but extensively by LE, military programs, and NASA. The largest of which has been Quantico in Virginia. The loss of fine motor skills during stress induced tests, and therefore replicating a deadly force encounter, is a well documented phenomenon, along with all the normal physical reactions, ie. tunnel vision, noise exclusion, time displacement, rapid heart and breath rates, etc etc. I ain't going to discuss the whole spectrum of stress induced physiological changes.. The studies have been done to death, time and time again. It is real. Sorry internet experts.
Stress and it's by-product should not be ignored by professional people, who are tasked to go into deadly force encounters.
It probably isn't going to be that big of a "problem" for 99.9% of the folks on this board, and that is a good thing. However, because it was mentioned by some as a contributing factor in a re-load of a pistol and scoffed at by others, I thought I would include my drivel as well.
It just ain't that big of an issue for most to worry about. So don't.