After 22 years of breeding and showing GSDs internationally, and 35 years of training obedience, protection, and rehabilitation of problem animals, I now own wolfdogs and if I were not medically retired I would probably breed them. A standard is only a collection of generally agreed upon goals subject to the interpretation of the individual breeder and as such, results in a wide variety of types, to the point where the more famous kennels can be recognized in the look of their animals. As late as the early 1900s Shih ztus in the imperial court were bred back to Pekinese to regain desired type as they were becoming more and more Lhasa-looking. So I suppose a breed thousands of years old is only a mixed breed too.
All dogs are mixed breeds, period.
They were molded by someone's vision of what they wanted in a dog, other people wanted the same thing and, lo, a breed was born. Next there will be laws saying you can't mix an angus with a limousin to produce a better quality beef animal. This is what breeding is all about, breeding what YOU think will result in a better animal. If you are doing for big bucks, and fame, you are in it for the wrong reasons, period. There is a great deal of records being kept on hips, and health by all the official agencies.