Sure, but part of that is saturation. 50 years ago 22% of US households didn’t own a car (vs 8.5% today), and 22% of US households owned 2 or more cars vs 59% today. So, the number of people with access is dramatically larger, which means there is a broader spectrum of people operating cars. And, modern cars have quite a lot more electronic parts, requiring not just mechanical but electrical knowledge.
Also, modern manuals still tell you how/what to check and how/what to maintain in addition to advising you not to be tempted by the delicious battery.
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Also, modern manuals still tell you how/what to check and how/what to maintain in addition to advising you not to be tempted by the delicious battery.