Sloped back on the German Shepherd Dog?

Does the sloped back of the GSD cause problems? How?
Update: Rawr - Ohh, I really like the looks of that working one...And I need a new working dog. I may just start doing some research on these working-bred dogs.
Update 2: ✯Love✯ is a German Shepherd Dog - Very informative, thank you so much!
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