While true, classic cars are "simple" in that all of their parts can be replaced and remade in people's home garages with commercially available tools like lath

While true, classic cars are "simple" in that all of their parts can be replaced and remade in people's home garages with commercially available tools like lathes. I've an '81 VW van in my driveway that begs to differ. It's got a bad idle stabilizer. The vehicle won't start unless that electronic idle stabilizer is bypassed. It runs fine in the bypass state, and good thing, because NOS parts ran out a few years ago. There might be efforts to create a clone (haven't checked thesamba.com in a while). I'm sure a clone is doable by someone that paid more attention in electronics class than I did, but no one is going to pop one out on their garage lathe. And that's just the electronics. It has mechanical fuel injection (fuck you, Bosch), but good luck making injectors in your home workshop. I'll not start on suspension parts whose manufacturing require a far larger hydraulic press than anyone is likely to have in their garage.