This is where I have a fundamental problem with the "skills concept" being conflated with "ski technique". Here is Ron Kipp's article again:
What I do like about Ron's article is that he identifies the skills concept as something separate from technique, while skill building is more about developing motor skills as applicable to skiing.
So.. if you you truly want to MA the above montage or any situation, there are three aspects to MA. One is tactics, which we'll leave off the discussion for now. Another one is looking for flaws in technique, which has almost nothing to do with the 4 skills. The other is perhaps to look at the 4 motor skills of rotary, edging, pressure and balance and see if the skier needs to generally develop motor skills in any particular area, or perhaps all of them, which I suspect most all skiers do need to continue developing all four skill areas pretty much always. There can be some situations where someone is severely lacking in one particular area, but in my opinion that is usually a symptom of poor technique, which is a separate issue from skill development.
Personally, I find the skills concept to be very useful for ski racer development, or for instructor-development, etc.. skiers that are able to be subjected a lot of regular coaching throughout the season. Where they are returning weekly or daily and have a long term project to improve their ski capabilities, most likely with an already existing well grounded basis of technique. So in addition to coaching technique, they need to do lots of practice skill building to develop the motor skills as applicable to skiing. Making them do lots and lots of this kind of skill development basically can develop their ability to react quickly and mindlessly to many situations on ski hill or in a race course. USSA materials stress the importance much of having this cat like skill capability. Overall these racer kids need to develop all 4 skills continuously and persistently on an ongoing basis.
But I want to say again...all of that is a moot point and fools errand if the fundamental technique is flawed to begin with. And personally I think if you see someone who is blatantly under or over emphasizing some part of the 4 skills, most likely there is some fundamental technique issue which is flawed and needs to be coached, which is a separate issue from the four skills.
Which brings us back to normal ski instruction. I think the skills concept is almost useless for normal recreational ski instruction where people get one or two ski lessons a year. In that environment, in my opinion it makes a lot more sense to focus on technique and let the skier go off on their own and try to master it. Its very rare that we get students who already have very sound technique and merely need to be coached through some exercises to improve their motor skills in the 4 areas of the skills concept. It can happen but its rare. Generally they are looking for bigger breakthroughs then that out of their $150 lesson or $800 private. Certainly, as you get to very high levels of instruction, that might be the case where the skiers already have incredibly awesome technique and for some reason they want to take a lesson with the ski school where you would take them out, show them around, give them a few pointers about enhancing this or that of the four motor skills, but those are extremely rare lessons to have, even with ski instructor training in my opinion it should be more focused on technique the vast majority of the time. Most skiers on the hill have poor technique, even quite good ones have technique issues.
Good technique will also lead to more efficient use of motor skills, somewhat automatically correcting complicated mixes of 4-skill under performance.
So in conclusion, I think we as ski instructors need to stop conflating the skills concept with technique. Learn when to work on technique and when to work on the 4 motor skills. I personally feel that the two are often conflated into the skills concept camp, to the detriment and loss of technique information.