Lobo - If you lean your whole body into the turn, that's called inclination, not angulation. Relying exclusively on inclination is called "banking" and in downhill racing or recreational skiing is usually considered a technique error. Angulation is when you create an angle between your upper and lower body, using your hips and/or knees, in order to put more of your weight over the skis while keeping high edge angles.
You need less angulation, and can get away with more inclination, as speed increases BUT it reduces the pressure you can apply to your outside ski, especially in the last stages of a turn when gravity and centrifugal forces are aligned down the hill. You can use more inclination if you switch your weight to the inside ski in the late stages of the turn, but there are other reasons why that's undesirable.
Downhill racers these days incline their upper bodies far more than they did in the past, but in most cases they are also at extremes of angulation in order to keep every ounce of pressure on their outside ski. Since you bring up Ingemar Stenmark, here is a picture of extreme inclination:
And here is a picture rather closer to what downhill racers usually look like, with the hips counter-rotated to produce angulation:
Now go back to your pictures of extreme carvers and tell me which of the images above they look most like. Those guys are angulated at the hip, especially in the latter half of the turn, just like Stenmark is in the second picture. To do that you MUST counter-rotate the pelvis or experience extreme lower back pain. It's a fact of biomechanics.
Now it may be that what we have here is a failure to communicate, to use a classic phrase. Counter movements of one kind or another have a long history in ski technique, and for historical reasons they tend to get lumped together and confused. Some of those are outdated and possibly made very little sense to start with. For instance, the Austrians used to advocate cranking the waist around in the opposite direction to the one in which you wanted the skis to turn. Thank god no-one teaches that any more. It may well be some such form of outdated insanity that Stenmark was referring to.
Now if people are out there teaching that all you need to do to create turns is bank the whole body into them, they're doing their students a disservice. However, I don't really think anyone is teaching that, because their students would all be falling over. In order to stay in control at low speeds, they must be angulating. The risk is that unless they're told to push their hips as well as their shoulders into the turn (or something similar), they'll be angulating exclusively at the knee, which exposes a week joint to injury and for most people is more tiring and less effective.