What I see there is this: skier balanced on the outside ski, which is engaged strongly. The ski is bending and turning, never going "straight". You can keep this static posture until you're turned 180 and pointing uphill and falling backwards...
What do you want to do: turn with the ski or separate? If I want to separate, I relax in specific areas and allow the femur to rotate with the ski (yes, femur rotation is a 3D movement when you consider the simultaneous adduction and abduction) or counteract with the body - that's a different discussion, but both are premised on the separation at the hip.
What do you want to do: keep the ski turning or release the ski? If I want to release, I relax the long leg and allow the edge to disengage - the long leg flexes in the process. I've jammed enough bottoms of enough turns to know that the leg can stay long and not release the ski even with a lot of femur rotation, until you decouple the ski's edge from the body.
I still remember this specific one - guess which frame is "UGH" with a lot of femur rotated and no flexing:
The difference between left and right is more relaxation, with allowed more flexing which allowed more adduction, with roughly the same degree of femur rotation.
All these happen normally at pretty much the same time and you want to be as little "on the power" as possible - that is perhaps the big and only secret that there is... not to mention that many discussions completely ignore adduction and abduction, without which we should not even have a discussion of a turn and without which femur rotation is useless.
All of these movements (rotation, adduction, abduction, flex) can be passive or active. Above I described a passive approach, based on relaxation, which is effective, efficient and how I want to ski most of the time, unless I'm out for a quick workout. However, if the timing of this or that turn is not perfect, some active input is needed here and there, as a compensation... but I think even here, adduction and abduction have a bigger role to play for compensations when you use flexing.
cheers
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