"If you have two guys set at 20, but one guy is getting 28 minutes of playing time a game while the other is only playing 18, they are not going to be getting the same number of touches or shots per game."
Sure, that's why I usually have bench guys who are great scorers with jacked up distro. Pretty common I'd think.
But yes to your last part- for sure. Different strokes for different folks. Some techniques are probably a little better than others but I don't think it's huge. Get the guys who are good scorers the ball.