That is a good question. Are you teaching people how to sing better or giving a class on vocal pedagogy? It seems to me that people who want to sing better do not care about the physiology and teachers do not want to use it for training purposes. They seem to feel that maybe knowing about the physiology may help them as teachers but the physiology may hinder progress in the actual vocal production of students. Feeling and doing are better than knowing what causes the outcome.
This is not my own opinion but it seems to be the general consensus when trying to get people to discuss anatomy and physiology involved in singing.