Like a lot of things tuning and waxing, there are multiple ways to achieve success relative to ones own needs and perspective. As long as people understand what they are trying to accomplish, finding their own way to get there can simply get down to personal preferences and experimentation over time.
Edit: Snowfan might be able recall how our skis compared in the glide department.
I don't recall how our skis compared. I do recall when you taught me how to Roto, that I started out spinning in the wrong direction and was corrected. Been doing it right ever since. The brush working in the same direction as the snow travels along the base is intuitive and common sense. I don't know if it actually makes any difference physically, but it sure does psychologically.
Terms like "moving away from you" and tips from a XC 'site added to me misunderstanding.