[PorterDuff]

"where a single chip can cost 300$ and has to be shipped from mainland America..."

that assumes that the failed part is even available.

I'd sure be irritated to have the controller board for a Cadillac XLR convertible top fail and have to shop junk yards, no doubt the wrecking yards are hip to small things of value that they can store on a shelf somewhere.

To be fair, I know more than one purchasing guy, usually in boutique electronic product companies, who spend a fair amount of their time tracking down obsoleted parts on eBay to repair or build one last batch of a metal box with circuit boards inside. It's just the nature of modern times I guess, but luckily we can often pick the era we want to live in in our personal lives.

I just need to stock up on old Thinkpads, avoid home automation, and carefully choose any car purchases.

[boznz]

Unfortunately there are very few car electronic controllers made in the last 20 years where you can replace modules without re-coding them... a $2 part from the scrap yard is useless without the manufactures re-coding software and a couple of hours at the dealership. Unless you're rich I doubt there will be any "classics" from 1990 onwards you can maintain yourself.