Sorry, as a mechanical engineer going to have to roll my eyes suuuuuuper hard at that take.
CAD lets people like me put onto "paper", and into the real world exactly what is in our heads, and do it with good tolerancing, well defined curves, and straight lines/flat panels.
What you see with "hand made" before was a machinist going over the molds with a file until the test parts actually fit together the way they were supposed to, or something approaching it. The tolerances were huge, the gaps were ugly, the lines are screwed up because things had to be tweaked until they fit.
What you are actually complaining about is the designs themselves, not the methods people are using to make them.
Also, the fact that you are lumping CAD, AI, and CGI together is frankly insulting.