So while the posture might be "precise" for a given student, it might not be "precise" in the sense that all students must do it exactly the same. Other than that caveat, I'd agree with you.
Good points Mike.
One thing I learned from Aunkai was training with locked knees or elbows for some drills. This removes one variable from the equation for the begining student. By doing so the student increases his/her chance of feeling other specific areas of the body and the connections there. The knees can be added in later once a basic understand & proficiency is obtained. I am not sure if you agree with that method but I have found it useful.