Keeping your body from moving forward over the bars by countering with your muscles while you brake in an emergency Is also a major point of weight transfer. After figuring this out I never went over the bars again.This is the first thing I taught my young children. I have owned and ridden motorcycles and letting off the front brake when the rear wheel skids Is equally important.
I can lock up both the front and rear wheel on my Burly bongo without going over the bars.