It matters when showing that professional instructors can be wrong, shattering the illusion that everything must work as instructed. I followed the steps months ago for this shot, exactly as Stan describes, yet my CCB was not directed to a 1/2 ball aim. He was so matter-of-fact about it being a 30° half ball shot when I knew it wasn't. So I figured I was just doing something wrong with my pivot or perception, but still wondered how he could drill the shot with stun and aiming at half ball. His error left me questioning the entire process he was trying to teach.
Who ever said that a professional instructor can not be wrong? They are human just like anyone else. And who is to say that one is actually wrong? Have you ever even considered that just maybe, with his eyes, he is correct?
And, why does it matter to you so much if an instructor is wrong that you have to go on and on and on about it? Was your world really shattered that badly at your discovery?
Why be so fixated on an instructor being wrong, when you yourself have been shown to be wrong so many times on here? Are you not also an instructor? One that has a book out?
Do you not yet understand that by being fixated on what you can find that you think is wrong, that in so doing you entirely miss the big picture and thereby never do really learn anything that would actually benefit you? Don't you think that your time would be better spent if you tried to glean what would benefit you rather than what you can find to discredit?