Good luck repairing a car now. They are way more reliable, and way more tolerant to owner neglect, but give me an old BMW 2002 or VW bug and I can repair pretty much everything in those machines with my Haynes manuals. Safety on the other hand is orders of magnitude better today.
Most faults on modern cars are still mechanical. OBD scanners or adapters are cheap. YouTube has replaced Haynes/Chilton manuals for instructions.
Well yes, obviously. I was simply expanding on the parents comments that it was difficult to learn to repair your car (or potentially a washing machine). I don't think that's necessarily accurate. Yes, YouTube didn't exist, but it was still possible to get information to rebuild a carburetor and Pep Boys has been around since the 30s. Newer cars are just objectively much more complicated, and when it comes to something like replacing a head gasket, sure it's doable, but yeah I'm going to get somebody else to do that. On the other hand, if it was something like an old flathead, I could feel confident doing that on my own.
Most routine maintenance items are still easily DIY-able and there’s likely an enthusiast forum or group to help give some guidance.