They aren’t so much harder workers more than they are incredibly devoted to their work, and are very committed to doing a quality job. That’s been a part of the German psyche for decades.
Just don't call me while I'm at the brauhaus.................
I agree that they like things done right. The don’t like to deviate from perceived correct ways of doing things. That said, doing things right had better not cut into vacation time, sick time, deviate from outlined responsibilities in a union contract, maternity leave, etc.