Just to argue I suppose, but the focus of what 'good' skiing is can be dictated by many factors. Sure, it's easier to carve on new gear, but using your 'skidding example', I can teach elements of timing, duration, structure/stacking, and separation using a very soft, skiddy turn. If you saw me teaching yesterday, this is exactly what I was doing, and going by your post, I'd be another PSIA object of ridicule. In reality, you'd be missing the larger picture of what we'd be addressing in subsequent sessions. It's not a huge stretch to add pressure and edging to graduate this all into carved turns on appropriate terrain.
High end performance carving is an athletic endeavor that isn't at the top of the charts of many skiers in North America, particularly those whose home area includes a lot of steep, ungroomed terrain and a strong 'go off piste or go home' local culture. That said, it is a skill that a true 'expert' should have in their bag of tricks.
>>>" I can teach elements of timing, duration, structure/stacking, and separation using a very soft, skiddy turn. ">>>
Yes, but that is a matter of edge control, proper ski guidance and body position while still retaining turn shape. And I'll bet you didn't use up UNWEIGHTING either. There are many nuances to the new modern turn. You don't have to ski on rails to employ the fundamental techniques. There are many instances when I don't want to be on rails, but my fundamentals do not change.
>>>"Just to argue I suppose, but the focus of what 'good' skiing is can be dictated by many factors">>>>
YES!!! And that is why it is so important to focus on the root fundamentals. Everything else is just an enhancement of them. Here's how I approach things (I know I've broached these things in other threads...
1) Turn shape. Absolutely the most important thing in skiing. Without a good concept of your turn shape, no matter what you are trying to do you cannot ski well without it. Correcting poor turn shape alone can often correct mechanical issues.
2) Continuous active inside ski. This is link to turn shape. It creates the torque for everything else to function providing opposing force for other mechanical necessities. [Lots to discuss on this one]
3) Proper transitioning lateral body position. This is the secret sauce. It unlocks everything, particularly the feet so that the skis, particularly the (new) inside ski can be activated. It provides the position for the outside ski to assume pressure at the appropriate time, establishes a platform for the completion of each turn and allows initiation with the new inside ski with a minimal (or no) upper body movement.
Focus on those things and you're more than half way to skiing great in all conditions and terrain.
You can run an entire lesson at any level just cycling thru those three things.