"Most instructors have never heard of controlling speed with absorption and extension," http://mogulskiing.blogspot.com/ , and it seems true 6 years later, too.
The physics involve a combo of parametric and driven oscillation (as an approximation) which may be a mouthful. I realize a lot of people on here aren't gonna want to do any of this, on-snow or off, in terms of practical learning, but most of us have pumped a swing before. And of those of us who have, at least a considerable number also should have figured out how to suck up speed on a swing, too.
It doesn't mean that it should be a dominant technique on-snow, but even in terms of determining whether a shoulder launches you, or you settle into it and regroup, the physical (not intellectual) understanding of this stuff does matter for people who want to ski well.