People tend to be a little more bright. Second, lets talk realism for a second. If you are to hone your shooting skills in a video game the videogame by its very nature MUST be as close to the real thing as possible or it wont be much of a training aid. Those skills listed above are mostly weapon operations skills. Lets talk true shooting skills.
Real shooting requires it for true accuracy.
Jerking a trigger of course will result in missing at any sort of distance. Okay how about shooting positions. I guess that leaves more practical shooting considerations at close range that the games must have had to teach. I guarantee you have not for it would have popped your brand new digital speakers. In many video games I can get a fair number of hits while moving, jumping, flying through the air, or while being hit by an opponents shots.