VRS - the theory - was and still is taught however, practical demonstrations of recovery ceased circa 1980. I am unsure of the precise date. I was reliably informed that the reason was simply because the risk of inclusion in the course and the fact that there were few documented occurrences outweighed the consequential aircraft life reduction and potential educational error.
I believe that in later years the same analogy was used to justify a revision in EOL.
Best Wishes