Maybe I am wrong but I like to think that after some 65 years of handling guns, as a soldier, armorer, LE officer, collector and shooter, I am reasonably competent at safe gun handling.
But nonsense like "... if you can't clear a jam, or reload while keeping your eyes on target, then you need to practice. This goes for semis and wheelguns" makes me cringe. That may (or may not) be good advice in combat; it is garbage on a range or in recreational shooting. In most peacetime situations, it can be a recipe for dangerous gun handling. Why would anyone want to fool around with a loaded and jammed gun without looking at what he was doing? If I see someone obeying that "dictum", I don't want to be in the same county.