There is a inherent "flaw" in the "what works best for you" with newer shooters; especially when they get to the point to where they're heading to a shooting school. I sense that's the point the author is trying to make. A new shooter can do what he/she thinks is working for them, and as it turns out, is completely wrong. You actually see this in most every sport. They gravitate to what feels natural to them, only to find out that supposed natural feeling is what's holding them back.
For someone who has been to more than one school, has shot competitively, and is an experienced shooter, they have been exposed to enough to know what works best for them. And an instructor ought to be able to work with that.
