|Ric, if you have the time could you elaborate on the the distinction between the two?
The two being "rotation" and "rotary skill". Max it has to do the word "skill". Look up the word skill.
Maybe the best way to approach this is to step back from skiing and look at another sport or art. Take martial arts. Every student who initially walks in the door as a beginner knows how to kick. Unrefined gross movements of kicking. they don't know when they should kick, how to isolate the movement to the desired parts for greatest effect, or how to perform the movements in a way that doesn't distract from their other martial skills and their balance.
It is the same in skiing. Every skier can cause rotation, but can they blend it in, blend it out, control it, and isolate it to the desired parts of the body in a skllfull way so that it doesn't override, interfere, or distract from their other needed skills and balance? Can they blend it in a way that enhances their ski's performance and achieve the desired outcome
So we can say that being able to kick is not the same as being skillfull at kicking. The same goes for rotary in skiing. Being able to cause rotation is not the same as being skillfull as using rotary movements skillfully. To speed the movements up or down, or remove the movements entirely from the equation. Not to mention refining the movements to a point that we can isolate them to various parts of the body to efficiently achieve a desired effect. Hope that helps clarify.