I do get the gist off what you are saying but how many skiers do? Since the movements are rather simple, I conclude that there must be a lot of misunderstanding surrounding letting go of the old turn. As you well know, letting go of the old turn efficiently is where most PSIA level III candidates fall short. How and when we release the old turn is the key to upper and lower body separation and being truly in dynamic balance.
In my mind you can release the edges, release the center of mass or both and still turn. I see many advanced skiers whom are releasing the edges without truly releasing the center of mass. Many believe releasing the edges is synonymous with releasing the center of mass. These skiers release the edges by relaxing the outside leg or tipping the feet and the center of mass crosses the skis. If you diagram the path the cm takes and the skis take you can understand the problem. The second the edges are released (even though still on edge) the skis stop following the old turn and break for the gravity line into the next turn. The result is a traverse between turns. The cm follows a much more curved path. These skiers must hang onto a turn in order to finish a turn as a result of how these skiers are releasing the edge and the center of mass. They cannot release the center of mass without letting go of control of the turn arc. In order to end confusion I prefer to separate edge release from cm release.
The key to efficient release starts with a bit of geometry. Always keep the hips square to the direction the center of mass is actually moving. This holds true from everything from a traverse to a pivot slip. if the upper body (hips up) is facing In the direction the center of mass is moving the skier can never be seen as rotating and with be in rock solid balance on the outside ski. Of course this requires constant movement to maintain this relationship. It's easy to keep track of because it's also where your head is going. Don't confuse where the head is going with turning your neck. The reference points are different between where the head is going and where you eyes are looking. Keep your middle ear happy.
Keeping the hips square allows a skier to easily time the release. After a skier turns out of the fall line they look for a spot somewhere above the next turn apex. When the hips are square to that point release the center of mass by relaxing the ankles in dorsiflexion. Dorsiflexing the ankles releases the center of mass on the gravity line while the skis continue the arc (skier stops shoving the cm around the old turn). Reduce the edge angle all the way to flat keeping the feet under the hips and the hips level by using equal tension between the legs (more 50%-50% feel, short leg/long leg) . The skis will finish the arc and your cm takes more of a traverse, opposite of what most advanced skiers do. As long as the skier does not let go of the new inside foot and transfer pressure to the new outside foot, the edges with go flat together and change edges even without conscious tipping of the feet.
The above paragraph is a way to think and learn and not necessarily a way to ski. Once managing and releasing the center of mass are clearly understood all forms, the kinetic chain are icing on the cake and make all forms of rotary, edging and pressure possible. Balance within a 360 degree sphere around the cm, over the platform, not on the platform (upper and lower body separation) but keep the platform under the center of mass (sweet spot in line with the force line using kinetic chain).
nolo, about 7 or 8 years ago you started a thread more or less based on my last sentence. At that point I had my level III but I certainly did not understand your reasoning then. I do now.
Too much typing with a soft cast on my right hand.