Is the process of countering also meant to store energy, like a coiled spring, for the next turn?
Earlier in the thread it was recommended that the upper/lower body seperation should come from the femurs rioting in the hips rather than at the waist. Rotation the upper body over the hips does engage the larger muscles of the core and produce a lot of stored energy. In golf this is called the X Move, and helps engage the entire kinetic chain to produce a powerful swing. I would imagine that trying to isolate the rotation to the femurs would not have the same effect?
The term "anticipation" has been used to describe this as well. Lito Tejada Flores used that in his books.
JASP I'm sure is correct that it's not the "right" thing to do anymore, but it still happens and it still has relevance. I often use the analogy of a twisted hose. If you let go of it it will uncoil. Sometimes I'll take off my glove on the lift and hold the fingers in one hand and with the other twist the wrist area. When I release that hold the gloves straighten out. This is useful to explain upper/lower body separation to a student.
I don't see how the physics have ceased to exist in spite of newer approaches. If you turn your legs in the hip sockets they still will naturally straighten out if allowed to imo.