In the light of the above, I was amused to find this in an old Dancing Times, commenting on the POB school:
"The teaching is of an excellent quality except, I am sorry to say, that of Harald Lander; my opinion of his teaching is confirmed by the Opera personnel as well as the press. His classes are too "Bournonville" and not adapted to our contemporary requirements."
This was in 1954. The writer was Pierre Tugal, French author and curator of the Archives Internationales de la Danse.
On the other hand, Tugal quotes M. Ritz, danseur etoile, as saying:
"The training being always of the same nature, the standard remains constant. Nevertheless, our teaching has been adapted to our present day needs. I try to make a synthesis betweeen the strict placing of the classical school and the dynamism necessary to present day dancers. A characteristic feature of the Opera repertoire is the variety of styles, and our artists must be able to interpret these various styles."
...which I imagine could be repeated word-for-word by a teacher today, nearly 50 years later.