Kook, Routinely is a bit of an overstatement. Softer and shorter skis lack the longitudinal stiffness of the old 204 skis like Schmitt was wearing. A more centered (less levered) stance and wider and two footed stance came about for a couple reasons. First is the Usable RoM and the tail carve of yesteryear produced a lot of blown knees when the tails of these short skis didn't release. FIS responded with limits on length and shape (sidecut), and courses were set a bit differently. After all racer safety was a big concern. A second response was the wider and two footed style which is more prevelent nowdays, mostly because it offered a way to gain back some of the stability lost on the shorter and longitudinally softer skis. A role performed by blocking pole plants back in the day. Which is something that is far less prevelent nowdays as well. Somewhere in my archives I have a USSA coaches clinic from 2001 where this advice was offered specifically for this reason. All of these are departures from the style being used prior to the switch to shorter skis.
What we see today includes a bit of a step at times but that is different from how we all skied years ago. Back then, the White Pass Turn raised eyebrows since the edge change was done on the downhill ski and the outside ski was held off the snow until we approached the fall line. It's not like the one footed skiing drills didn't exist, it's just that the acrobatic WPT being used in a World Cup race was seen as unconventional. I doubt that would be the case nowdays. If anything raising the inside ski and keeping off the snow through our turns, or even at the WC level would be unique and somewhat unconventional. Perhaps the flexing of the hip and knee and how it drives the shin and foot forward gets mistaken for actually lifting and keeping the inside foot off the snow through our turns. Standing while facing across the hill one leg is going to be shorter than the other. Same thing happens when we are inclined in a turn. That should not be construed to mean the inside ski stays off the snow, or the momentary step is more than a momentary thing. I think if you review the videos you offered we would see both skis on the snow and working at the beginning of the strong shaping phase. A departure from holding it off the snow and letting it come along for the ride.
At a more recreational level, PSIA and many other teaching organizations from around the world teach a much more two footed stance than we did back in the day. We also avoid teaching tail carving because of the inherent risks to the skier's knee. Having lived through all of this and updating how I ski and train instructors, I would offer that as part of the proof that evolution is occuring in our sport and it will continue in the future. The skis will play a big role in that. If that wasn't the case we would all still be doing Arlburg turns. You may, or may not know how to do those turns but the point is we don't ski that way even though a lot of world champions skied that way.