IMHO, classifying all non-arcing turns as merely skidded is a drastic over simplification. Naturally a pure arc is the ideal. But whether we all want to admit it or not, we are not all laying down perfect arcs all the time. I would wager not even the majority of the time. .
For example in many scenarios carving a pure arc is impossible(steep terrain or deep powder for instance). You then utilize other skills to manage terrain, speed, direction ect..
In America the average skier I think is too obsessed with carving. I believe this has to do more with image than with needs or desires. Somehow they feel carving is the ultimate goal and a sign of skiing prowess or something like that. That was true in the days gone by when straight skis ruled - if you could carve clean arcs on 220cm straight skis you were rockin it. But with todays skis the skill of carving is made so much easier and efficient by the sidecuts available. It is simpy just another tool available in the average skiers bag and IMO too often overused - situations such as park and ride where the skier really has no control over his/her direction and is just riding rails on a crowded trail.
I think the average skier today needs to concentrate less on carving and build up a more all-around skill set. IMO the drawback of the new super shaped skis is they are building a one-dimensional skier who really cannot ski the whole mountain. The obsession with spending the majority of you time learning to carving clean arcs can lead to a whole lot of trouble on the steeps, in the bumps, and in the POW.