It's clear I read your whole post since I responded section by section. I don't put my hands behind my back when I play, I hold them to the sides and up to prevent passes, and your sarcasm doesn't strengthen your argument. If you have your hand on someone while they're driving (which happens inside the arc too, btw) you will push or impede movement, even if you don't realize it. I play enough basketball to know that. You do not need to use your hands to keep your body in front of someone anywhere on the court. If you do, you're impeding their movement. If you can't stay in front by moving your feet, they beat you fair and square. Like I said, the only reason to touch a player with your hand is while trying to watch him and the ball simultaneously to aid in feeling his movement or using one forearm on the offensive players back in the post to maintain position as long as his back is to the basket.
To expand on the use of hands, I am also against offensive players using their hands to get by defenders. I hate the hook move along the baseline that we see far too much of. If you don't have good enough footwork to execute a proper spin move/dropstep, you're not good enough to beat the defender. It goes both ways for me.