vitriol aside this actually is perfect to look at.
Your impressions are wrong. Counter balance means balance... not assume a position. This isn't Statics 201. Can you walk? I'm going out on a limb here assuming you can stand on two feet and periodically can put one in front of the other, but here goes. If I said @chad, "go stand in that corner for the next hour, because everyone who has read your posts is now less intelligent having done so" and you proceeded to walk over to the corner for your time out, you're going to balance on one foot and move the other in order to take a step right? Then you'll repeat until you reach your corner. If you prefer to hop two feet at a time by thrusting your core forward, good for you... keep winning. But... if you're like the rest of the bipedal universe, you're probably going to balance on one foot while extending the other to create the forward movement.
Skiing is really no different. Balance on one foot... move the other foot. With skiing though, the movements are lateral because this little constant called gravity takes care of the forward part for us. The motion we are left with is tipping of the foot that can move so we can redirect our momentum and make turns. This is why a skier needs to be trained to balance on the BTE while moving, because when tipping begins, balance is dynamic. This is how a skier gets ski performance, but you can't stop mid turn and strike a pose, or you're back to skiing on your face; having been taught a lesson by our friendly constant called gravity.
To revisit last Monday's topic (is this like self-deprication Monday's for you or something?), as noted above the feet STILL move first... for the bipedal universe anyway. Nothing changed since last week, but good job at not really learning anything this week. If you move the core first in this particular application, you hip dump. Congratulations, you're part of the problem Paul (@MrSnowPlow) was highlighting, and the reason this thread was started! Keep up the good work; people like you are why EpicSki has any topics at all in the Instruction Forums. Talk to you next Monday!"
Lets go with the implication that skiing is like walking. From the spinal engine perspective it is NOT the mechanics of the legs that create the torsion to deliver one leg forward and the other back. The feet are not the first part to move, in fact to have the ability to unweight a leg there is first a postural shift to the stance leg. If I am going into the corner I can do it with more effort from my legs by keeping my spine and trunk rigid or I can reduce the effort by allowing the spinal torsion(counter rotation) to occur without impedance.
The stance leg hip extensors fire (same as the outside leg in a turn) , they cross to the opposite side via the lats effectively pulling the upper spine back, as long as the opposing tension along the front of my body is not interfering. Not only does it save the muscle of the arm from having to activate swing (no counter-action required), the lengthening of the tissue on the front stores that elastic energy, so when I step down and alternate legs on my way to the corner I can use less muscle effort and use the recoil of the tissue. Now that the trunk is organized to oscillate I effectively need less effort in my legs which allows them to be more dynamic adjusting to the terrain, their real job
IMO though skiing is not like walking, as HS pointed out we are sliding downhill, so automatically there is going to be a reflexive adjustment so we don't fall backward. This creates the imbalance in the muscles of the trunk, making the oscillation/counter rotation more difficult. faster turn, more force, more effort to prevent collapse. So unlike walking we may not have the availability of fluent reciprocity we have in walking. We need to be able to dissipate the force more, potentially by using more of the inside leg, it bears more weight and decreases the effort needed by the trunk, making it more mobile (see power turn video above), restoring its ability to flex/extend, sidebend, twist, etc. The other option is to gain better awareness and control of the trunk, which a MA would help with I believe.
Coming full circle now, skiing, like walking, like all or movement is anticipated because we have eyes, a brain, and experience. Its amazing to think we calculate and essentially see into the future of our movement. Because we can we can, we set our postures to be very dynamic, not having to wait for the assembly of kinetic chain dynamics. Its the difference between feed forward and feed back movement control, dialing in both make movement more enjoyable