So can somebody explain what skiing with your pelvis means?
On the other hand, skiing skeletally does make sense, especially for those who are less fit or older. But I would hardly aspire to it as a way to avoid fatigue. One does "stack" against a strong force, but as a temporary means to deal with the force. As terrain changes, the body has to be able to absorb, extend, react, move forward/back, push legs into snow, rotate them, pull them, etc. In other words, it seems silly to talk about stacking and skiing skeletally in very rough conditions or bumps - unless one completely extends the meaning of stacking beyond what it really means.
My interpretation is to ski skeletally when needed and remain flexible, dynamic and ready to anticipate terrain changes otherwise. If you have to rely on stacking to make it through the day and avoid being sore, get in shape. I bet 50% of people who take stacking at heart, are static, park-and-ride types.