Wasn't actually just made up by one of the instructors, it was in the manual of one of the major Moorabbin schools.
Someone wrote the flying school manual and probably copied some other flying school manual with a few minor variations. Either way, a flying instructor- possibly the CFI or the CFI before him used his position to push his personal preferences (flying techniques of course) which then are published in the company manuals. As a student at a flying school you are more or less are bound to follow the company published procedures even though they are always a matter of personal opinions.
However, that should not prevent you from questioning those procedures if you have a contrary point of view based upon your own experience and study of the subject.