1. There is no magic - there has to be local muscle involved, and yet the involvement of said local muscle is quantitatively different if other parts of the body are being used in an optimal manner.
2. In my experience there are not so many good athletes who are doing similar things really. What is perfect technique? If you are good enough to beat your competition, then what is the point of improving further? The number of people who *really* pursue this is not so large I suspect.
And of course it is really hard to perfect all phases of a particular activity. For example - see the commentary on a world championship winning throw:
There are a lot of good tennis players but not many at the level of Federer. Google "roger federer slow motion".