This is a nice thread, and I agree completely with SkiMangoJazz's comparison of skiing drills with the musician's practicing of (boring) scales and such. It's not about perfecting the drill, or the arpeggio, chord change, or fingering. The drills and scales develop skills, in ways both obvious and specific, and subtle and global. They develop discipline, and only on a foundation of discipline can virtuosos truly express themselves. There is a vast difference between the disciplined athlete, musician, dancer, or engineer "improvising" and an unskilled, undisciplined person just wingin' it.
A true expert--and particularly an expert instructor--can quickly and easily imitate the style and movements of virtually any skier on the mountain. Upon the foundation of discipline developed through practicing exercises and drills, through intentionally exploring and mastering the entire spectrum of movement possibilities, they can ski any way they choose--not just the only way they can. That's freedom! When free-skiing, great skiers--including instructors--express their unique individual style. (Yes, unfortunately, it is true that some skiers and instructors have forgotten that the scales are not the music, and that drills are the means to freedom, not the goal themselves. But that's another story, and those people are far from experts.) But it is the highest level of achievement to be able to eliminate personal biases at will and demonstrate movements uncluttered by personal style, or to adopt the movements and mannerisms of another skier at will. Experts can ski like anyone. The reverse is not true!
And so, I like the skiing of Snowbender in his video clip. While it is not the style that I would usually prefer for myself, and it alone does not make him an expert, I contend that few skiers on any mountain could imitate him. Any true expert could easily imitate his movements and "style" if he wanted to. While it is true that few experts ski like him (very often), it is also true that anyone who cannot ski like Snowbender is certainly not an expert.
Anyone would benefit from turning Snowbender's "style" into a drill and seeking to master it, even if you don't like skiing that way. In ways that perhaps few might understand, Snowbender's "exercise" is helping him master many important nuances of expert skiing, including subtle edge control, mastery of rotational (angular) momentum, and fore-aft balance. As an exercise, he is developing a "touch" that few skiers have, but all would benefit from.
And that's what drills really are. They are not skiing. They are an intentional divergence from one's personal "style" for the sake of broadening and deepening skill, touch, and movement options. Style is a great thing, but when it becomes a bias, it imprisons and limits, rather than freeing and supporting expression. Exercises are often an attempt to find pure form, unadulterated by personal bias, in the name of discipline. Discipline which, as skating champion Elvis Stojko famously said, sets you free!
Best regards,
Bob