A few points to make here:
First, surely in the reverse turn (foxtrot) the man is on the outside of the turn?
Second, If important technical material is written into an introduction to a text book, it's been written into the wrong place/ Maybe by 'introduction' you mean a preliminary chapter detailing general technical points which are important. but an introduction just introduces the textbook - or should
third, i agree entirely with the points which have been made about teaching beginners inappropriate material which is too difficult. But social dancers want 'steps' which they're proud to show off, even if executed terribly. I guess it's human nature.
The 'strictly come dancing' programme in the UK (is it called 'dancing with the stars in the US?) was a perfect example of it