You nailed it about aerospace: the manufacturer I work for makes aircraft that were certified in the 1950's. The visitor entrance to the production facility has

You nailed it about aerospace: the manufacturer I work for makes aircraft that were certified in the 1950's. The visitor entrance to the production facility has the type certificates framed near the entrance. We routinely design "new" aircraft that are basically lipstick on the old grandfathered in designs from decades ago. Whatever it takes to not have to recertify.