Ms? Sorry 'bout that. Anyhow. Again, there's no universal. It depends what my students (group or individual) seem to need. I certainly don't mind doing some very basic work with never ever's without poles. And the crossing the arms over the chest is but one among several that can be used higher up the food chain. Personally I can think of about a half dozen that get me there quicker, but again, it depends on the client/student. I guess I'm wary of what you're posting because your methods seem prescriptive... if A then do B, etc... a one pill fits all.
And checked your info page... you liking your Hero Master's?
I realize a lot of people here are very good skiers, pros, probably have been teaching a lot longer than I have. So some of what I state might come from being a new to teaching however I was told and believe that if you are relying on arms, and falling into turns then obviously something is a miss. With that stated I have been skiing since 7 and average around 14s handicap right now. I have yet to put decent skis, and boots through a course and have always been on sub par equipment. The ski area I work at has a program for youth. We do not let them use poles through the program and might for some at the higher level but I am not sure. When we work with beginners we never give poles.
Personally I never questioned my own skiing all that much, but this year it went through tons of questions and lots of analysis. This year I spent a good 75% of it without poles and just doing drills. What I found was that my own technique could be improved a ton. At the end of the year I was carving complete turns with no skids what so ever or lift of an inside ski (old school habit). You asked how I like the Hero Masters, they are amazing. The best GS skis I have been on but take a lot to utilize correctly both in energy and technique. Like I stated before I have always been on sub par equipment but still managed to do fairly decent. This year I took 3rd place on the Midwest Nastar program with 27m skis without a race plate and very sloppy vector boots. So I do have some qualifications on skiing, but still have a lot to learn. I respect this forum a lot and the opinion of others. With that stated I do not see poles as a have to, they are a crutch if you cannot ski without them.