I have difficulty imagining PMTS as a stand alone progression for a beginning skier. I believe side slipping and pivoting are essential skills to learn early, even if just from a safety perspective. Their more recent videos are also somewhat demanding, in the newer Eliminate the Wedge series (a beginner/early intermediate progression), they teach doing the entire turn on one leg (mostly whole ski, not just tail) starting with a traverse on the uphill little toe edge. I don't mind spending my entire ski season working on just that (my current goal), I am not sure everyone would feel the same way.
Nevertheless, I suspect a number of skiers would benefit from being exposed to PMTS. These older Harb videos are an interesting contrast to the Elate media ones, especially as he directly criticizes their methods. A gentler introduction may be needed but perhaps some exposure to PMTS could help beginners avoid making basic mistakes years into their skiing.
It was a little challenging hunting down all the segments of Harb's new series, but eventually one linked to another. I think there are six, which are actually titled Lessons 1 to 5, with one lesson having two parts. And then Lesson 5 is labeled as part of Series 2, but I don't think there are any more parts to Series 2, and Lesson 5 is geared toward much more advanced skiers.
I didn't see any teaching of a traverse on the little toe edge in the beginner's series. Parts of the series are just Harb doing demos which are plainly beyond the capabilities of beginners. I felt the new series was disjointed, rough around the edges, and certainly very incomplete as a training tool for beginners. Harb's comments were ambiguous as to who would be the intended audience. Sorry, I think he needs a director and an editor.
Harb's older materials present a much more complete and slower paced method of learning for new skiers.
I've never attempted a direct-to-parallel teaching pathway with a brand new skier. However, with some novice (not first time) skiers who were real hard cases, who just couldn't seem to break out of being real stiff with no edging OR rotational skills in the joints, I have on occasion gone back to basics with a whole PMTS progression, beginning with dryland exercises. It's been somewhat effective.
I agree that side slipping and pivoting are essential skills for developing skiers. I don't know that Harb would disagree.
Yes, Harb's methods can be demanding. It's been noted more than once on this site that PMTS progressions are a lot less intimidating, and just, well, more POSSIBLE, on very gentle, wide-open terrain. Sadly, that's in very short supply at some ski resorts. Teaching methods are in part dictated by the terrain available.