The whole concept of what is "proper" technique is a little shady anyway. You will see skiers out there with sound but not perfect technique, but if they rip and are having fun, who cares? I keep making the example of Hugo Harrison - one of the fastest, if not the fastest big mountain skiers around.
What about old Stein as well? I'm not discrediting modern carving/racing technique the slightest bit, but he seemed to rip down the mountain pretty good back in the day.