But here is some food for thought.
FACT 1: In the CSIA L4 exam you need to do a manuever called parrallel with traverse. It is really as simple as it sounds...parrallel turn into a traverse, into a parallel turn, into traverse, repeat.
Sounds easy doesnt it?,....trust me, it isnt. This manuever has one of the highest fail rates on the exam. The reason it is so tough is the traverse makes it impossible to use the forces, or energy or momentum from the last turn to create the next one. It all has to be done with proper skills. Put another way, we all know that speed can be used to hide skill deficinecies...parrallel with traverse (pw/t)prevents that....no hiding possible.
FACT 2: If you "pre-turn" to start the turn on your pw/t you will fail. If you end the turn with an "oversteer" to get your skis under you, you will fail. To pass you must be able to go straight in, and come straight out.
Now having read a few of the posts here, I can see what you mean about the cross-over or end of one turn has the same effect of a countersteer....BUT is it necessary?
Well pw/t proves it isnt, and I think intuitavley most people here agree.
So the next question is...is countersteering, or oversteering detrimental? Or put another way, is it bad or inefficient to rely on the previous turn to assist with getting the mass across the skis?
I think this is pretty tough to definativley answer...but hey I'm Skidude...so I'll give it a shot.
Oversteering is bad. The reason is the act send your feet up away from where they will eventually need to go at a time or place in the turn (ie the top) where pressure is already very low. An oversteer will make it lower still, probably too low to effectivley get the skis to come around quick enough to prevent the skier from ending up caught inside. Not good.
This however is not to say the using the previous turns momentum to facilitate the mass moving across is bad. In fact I would strongly suggest it is a key part of efficeint skiing. However there is more then one way to skin a cat, and I think the efficeint way is through ILE/OLR or Angulation as MichealA pointed out. The Angulation idea is how I always thought of it...funny this is the firts time, to my knowledge it has ever been mentioned on Epic.