I don't think this is true if its femur rotation, is it? Involving most of the body implies upper body rotation, counter-rotation, or other approaches that no instructional organization (at least that I have heard about!) advocates any more. With subtle and controlled turning of the skis with the legs, it is relatively easy to make minor adjustments and it doesn't demand perfect balance.
But, I'm probably not understanding what you mean, and it's clear that you frequently disdain my ignorance in these matters, so there may be no interest in helping me understand it better.
Anyhow, the misunderstanding is in the way I used the term 'involving'.
When balanced/centered, the balance point is between the feet, just slightly ahead of the ankle -- pressure is pretty even along the sole of the foot. When in this position, moving the femurs in their sockets will enable equal displacement of the toes and the heels -- that's pivotting/turning the feet.... If the balance point is at the toes, only the heels displace, and if the balance point is at the heels only the toes displace -- not the entire foot.
Moreover, there are other gyrations that the upper body/hips etc have to go through to remain balanced when displacing only the toes or heels. These are minimized/absent when the balance point is "centered".
This centred balance is the origin of upper and lower body separation -- rotational movements in the lower body will have a minimal impact on the movements of the upper body. So, yes, while I am "just rotating my femurs" my upper body, arms, head, in fact every other part of my body is involved to ensure that the balance point is where it has to be for pivotting to make as little impact on the upper body as possible.
This is often mistaken by the untrained eye of the student as a "static" position -- it is anything but ( try it on a wobble board with a half ball on the bottom -- you'll move a lot.). It does demand "perfect balance" to pivot correctly. Which is why I have the issue with teaching rotary skills to the back-seated skier -- you also teach inefficient upper body rotation.