Honestly I think people forget this fact. You don't have to go that far back to find vehicles that you absolutely could do anything to yourself with basic tools.
We're fixing up a 1987 Jeep Wrangler for our son. I could strip it down to the frame with 3 or 4 tools. It's kind of amazing how simple cars were, and that was in the late 80's.
Yeah as long as you ignore the engine (ECU/PCM/TCUs) in cars in the 80s, they're quite simple. Go back to the early 70s-before and it's mostly all analog or trivial electronics.