Hi Frank - yes, I’ve tried to describe the basics. I think once you have the concept that removing leaves from one part of a tree and leave them in another is a way to direct and control growth, you can start to employ the technique in all sorts of situations. Growing a pine with a sacrifice branch is one case I can think of that describes the example you mentioned. In such a case, you can remove leaves (needles) on the sacrifice, allowing light and air to get to the lower shoots you need to keep while simultaneously slowing down the sacrifice.Combination cases where there might be more than one objective!
For example lateral shoot development lower down while continuing apical leader growth!
Some species it is important to develop lower branching prior to continuing with taper and apical growth.