When people get into this stuff, you lose me, and there is no way to transfer this to a player who has do DO things, not just analyze them.
I don't need to know what my scap is doing or even the name of the muscle or some jargon like hip coil, and the degrees of separation and everything else posted here. All the technical stuff is typically not for the doers, especially younger doers. It is to satisfy the adults around the doers. My showing is hitting the ball well or throwing it well. What technical explanation do I need?
The 'whys' are often shown in the results: Where does the ball go? What caused it to go there? etc. Some of these need to be answered by the athlete, some can be trial and error so they feel the difference, and they don't need lot of talk from the coach--think how much time it took to type some of those hitting explanations (can the hitter absorb that, think about it and hit the ball in .02 seconds?). You don't need to be a snow mobile mechanic to drive one fast (had to get a winter reference in there).