How things have changed over the years is nothing less than amazing. When I grew up people made a living making things with their hands. The old world was much more labor intensive and more people needed. Things changed with technology.
First the computers which could do math thousands of times faster than we could, which later brought on the internet and the ability to globalize that labor. It started with the blue collar jobs (I lived though NAFTA) and eventually got the white collar jobs too.
You mention CAD. I remember the days things were made by paper drawings, drawn by talented engineers and draftsmen. They used a table, mechanical arm, and a calculator (or slide rule). We had cars, appliances, bridges, buildings back then - using paper. Then computers came along and many of those jobs were gone. CAD systems changed the game big time.
Where will it go next? I don't know. Where does the human factor get replaced by technology?
Maybe the same place the computer people had trouble, and still do - junk in, junk out.
AI can (maybe) design a really cool part/assembly/machine - but can it be made - and at what cost?
Then again, after 35 years in corporate America, I never understood how they made anything to begin with.