A correctly built shepherd will naturally fall into that stance. As puppies we try to encourage that when they stand they stretch out. But most shepherds will naturally fall into the stance when posed. I showed shepherds for many years. Its hard to get one to hold the stance if he is not correctly built in the rear.
I don't think extreme angulation is beautiful OR correct. They've been breeding these GSDs lately to be crippled with dysplasia and unable to do what they were bred to do. They're a trotting dog and some angulation is needed to give them the reach and endurance to herd sheep. They are meant to cover the most amount of ground with the least amount of effort. Well, as you see in so many dogs, they've created weak, unstable hips and backs and virtually ruined them. Even their temperaments aren't always the way they should be. I've seen so many nervous, fearful GSDs lately, it's incredible. It's a shame. I think the German dogs are so much better and one needs to be careful when shopping for a GSD these days.
have you read the book about the search and rescue woman that was looking for "the dog". Her rescue dog ( i wish i could remember her name) was retiring. She knew that this was the one of her life..that this was the time. She bought one shepard in the states and the dog simply wasn't capable and she thought she had found the best..so she went to Germany. She wrote a huge comparison of the two different countries and their approach to breeding.