ANY Prof. who has earned his dance "stripes" thru many years of study, and training , with the best of the best, knows that the "book " was never anything more than a tool, for taking exams.

Theoretical exercises ,have been around much longer ,than the text books that now exist . I could quote several variations of Frame/Hold all used by world class champions.. which begs the question.. which one is correct ? .

And again , I quote Srivener.. " There is no such thing as absolute technique ".. the reasoning ?,,,, Circumstance, does change standardised theory, in some cases .

So Chris, your perception is just that.. " Your " perception .