Did Boeing forget how to make planes? That dumb 737 Max that took them down? ? What were they thinking?? Less energy use? Just raise ticket prices. We want more miles per gallon? Less smoke out the exhaust? Trying to save money? And you lose.
Look at the 747 was a perfected plane that came for the late 1960s? No computers? And what about the SR 71 Black bird, same era, and they can’t duplicate these days even with computers.
And what about that Shuttle that blew up on re-entry because they used new environmentally friendly insulation that broke off on lift off and knocked tiles off the wing. And the cars? They were perfected by 1970. Keep it simple stupid. The cars today are too complicated. If you get stuck on a country road forget about it. No nearby farmer and his shade trade mechanic son can help you.