Interesting point. When I played in college I received so much benefit from our shooting coach that I actually worked part-time at as a shooting coach at two universities after my playing days (and still will on a consulting basis from time to time). I went a completely different direction with my career and left that all behind a long time ago but enjoyed it a lot.
As part of my training, I was sent to get tips from a couple of pro trainers on how to better teach shooting. It was really interesting. One of the sessions was on adapting to your student. It was noted that some NBA players shoot that way (Dirk was the example giving during a training session). The point was how to tailor your advice to the shooter and have flexible methodology to help each player. So while I agree with you, and I've tried the "Dirk method" and cannot do it well, some players thrive with it, and there are ways to get better with that shot.