For those two (Panther & StG.) it's pretty safe to say they were designed & built very much under wartime pressure from start to 'finish'. Neither has much in common with any pre-war work by Germany. I'm often the first to enjoy critiquing chinks in German equipment and supply, but it has to be said there were some first class brains around. Good job the 'talent' was never as well directed as it might have been.