You know what this always reminds me of? Those old Kung Fu movies where they would argue over whose style is better, Drunken Monkey or Dragon.
There are several different instructional organizations, and members don't always say the same thing. When two experts say opposite things, how do you know who's right? At that point we have to think for ourselves, and here's what I think. Often it's just aesthetics, but sometimes not. It's not in this case. Comp mogul folks have different goals. They try to ski down the fall line with short radius turns no matter how hard the course. They have evolved a technique that is second to none for accomplishing that goal. You said it yourself, you use line choice instead.
Everyone gets back as they head up a bump. Comp mogul folks have all sorts of different teaching metaphors for getting forward early on the backside such as clearing the hips, jumping a chain link fence, foot containment, or knees forward. But, they all agree that in that first picture in my last post, it's too late. You can't be that far back at that point in the turn and reliably make that next turn while staying fluid and balanced. Does it matter? There are some aesthetic preferences that develop after years of training, but if you're getting down the mountain, balanced, having a good time, I don't think it much matters. But, if some of these folks try to follow some of the same lines as comp mogul folks, then it would matter. Therefore, it's fine until it doesn't work to meet a goal.
On topic, here's a mogul video with tips that I think are great. Listen at 2:50, then compare skiers with those tips in mind. "No Bueno on that ever." If you end up watching the whole video, you may notice some other divergences in technique.