BG said, "Picking above nock would be a bad idea. When we draw back arrow would be pushed higher."
No reason for the arrow to be pushed higher unless one is shooting three under. Folks who nock above use split finger. For those who use it, pulling an arrow out of a back quiver and nocking above the nock is the easiest and fastest way to nock the arrow. All I'm suggesting is that some folks, quite a few actually, do nock above the nock point. I suspect they find some advantage in it or they wouldn't do it. There are lots of different styles of shooting. What's best for one may not be best for another.