Sensible cycle training was around decades before Cyclecraft
Martin, we're agreeing with that. We're just referring to Cycraft because it handily saves a lot of words. Please read the following.....
I remember thinking in many places "that is just what I already do". Much of it really is the common sense brought on by experience.
Same for me too. I only read the book a very few years ago. It's almost exactly what I do already - but I didn't start like that. It took some years for me to develop good technique, via learning from mistakes and near misses. Cyclecraft should be good for beginners so that they don't have to learn the hard way.
I'm not completely happy with the "primary" term though (despite using it myself on this forum because most of us here know what it means). It's giving those who haven't read the book the wrong impression.
I fully support any cyclist in doing things their own way (within reason) - but that doesn't stop me worrying about them, hence the encouragement to use primary for SOME of the time, and not just when turning right.