I can’t think of an instructor who does not talk about shape.
There are so many different levels - beginner classes have stress toolwork and surface.
To the extent instructors can individualize a beginner will get a different class than and advance intermediate.
I have the good fortune to take classe from Liam O’Neil, David Ellsworth, Christian Burchard, Michael Peterson, and Johannes Michelson. I have been assistant/gofor for Trent Bosch, Cindy Drozda, Al Stirt, Lyle Jamieson, David Ellsworth, Jimmy Clewes.
All discuss shape. All stress the esthetics of curve without flats. The all talk about creativity and design and tools such as the catenary curves, golden ration, Fibonacci....
The leaps students make in the 3 to 5 day classes is amazing. As Paul says advancing years over what they could achieve through trial and error.