remember how many Redstone rockets blew up before Alan Sheppard's first flight, how many problems the Mercury missions had and the Apollo 1 disaster caused by the stupidity of having an un-necessary 100% oxygen environment? What about Columbia and Challenger, both designed pre-CAD? And outside of NASA and in commercial aviation, what about the DC10 with its blow-out cargo doors and vulnerable hydraulics, the Comet's square windows, the DC9's stabiliser screw jack and the 737 rudder PCU? What about the corrosion traps in older airframes that caused events like Air Aloha's cabriolet?
Try to find out the percentage of young "CAD style" engineers which do know what you are talking about. I bet 50% do not know that full list, and less than 10% know the real backgound of those events and what they should still teach us today. You can easily get an engineering degree today, and have not heard about any of those events in university. Companies employ engineers far more by their CAD experience, than by basic engineering skills these days...