Originally Posted by Jamt
Maybe we have different ideas of how this should be done.
If you lift the inside ski off the snow and tip your foot (lifting BTE side) you need to move your knee inside the turn in order to not converge your skis. Likewise if you move your knee inside you need to tip your foot in order not to diverge your skis. The two moves go hand in hand. I don't see how this is complicated or why it should break down if the ski is not on edge. I have been skiing like this and teaching it for many years.
Jamt, the idea of rolling the ankle, knee and hip while shortening the leg and turning the femur is not new.
The new idea is turning the inside foot towards the outside of the turn. I gather you feel that the outcome of doing so is the same as rolling on edge+turning knee. My sense, having worked on this yesterday, is that the intensity is on a different level. Moreover, turning the foot to the outside causes the tail to cut into the snow, so the turn gets shaped more strongly. "the internal knee and especially the internal feet work at engraving the snow, but without loading it," as Malfatto says.
From the video, this approach also leads to more dynamic entries into turns. When the skier makes a turn to the right, his inside ski is already intent on turning left. As he flattens his bases and starts extending the old inside ski, the skis will steer into the next turn.
As to why the tactic doesn't work when the inside ski is flat: the skis wedge. Yes, turning the ankle tips the ski on edge, so at a certain point the wedge will stop increasing in size. But if the inside ski isn't yet on edge once you start turning the foot to the outside of the turn, you're going to wedge.