I just completed my first two days of new-instructor clinic from a totally PSIA school.
I learned that I hold my arms too wide and my feet to close together. I didn't learn why...just that I'd ski better that way, but no reason given.
I learned that when doing one-foot skiing for balance drill with the feet wide apart it's OK to kink sideways at the waist to balance.
I learned to demonstrate wedge turns skiing like a frozen robot.
I leaned to hold the arms in a near-complete circle in front of the body with flying elbows.
I learned to keep my mouth shut and bite my tongue (something really new and different for me).
My goal is to get the teaching job, and the ski pass, and stealthily slip PMTS basics into the lessons I give. This is at one of the concession ski schools in the Seattle region. That's a big deal here. This school isn't the biggest and has nearly 700 students signed up for 6 to 8 week lessons. I'm not going to start making PMTS waves...I'm not even the new guy yet, just an instructor candidate.
My wife, who's a terminal low level intermediate, has seen Lito's and HH's videos and read their books and skis their style as best she can. She laughs at the PSIA stuff, too.
When I read all the steps and drills and progressions in the PSIA method the picture that comes to mind is a group of ancient theologians arguing about how many angels can dance on the head of a pin.
Ken