A fantastic review. Likely difficult for anyone encountering this material for the first time. Demanding and at times somewhat unclear with respect to the exercises to be performed. Great ideas, rigorous way to hone your skills if they are already fully developed. Otherwise, probably best explored as a coursebook with guidance.
I feel that Friedmann's approach is lacking in one sense: rhythmic considerations are of primary importance in contemporary music, and he fails to devote any energy to this most fundamental of musical elements. I would like to see some analysis, exercises, etc. devoted to rhythmic development, or at the very least an acknowledgment that Friedmann's focus is on pitch, which is only a single piece of the puzzle.