I suspect that back in the day there was a generation that were "the only ones who knew how cars worked" (in that it had a far higher number of people who could do their own car repairs).

It's the product of having grown up in a time when that technology was going from niche to widespread - a time when its still clunky, fickle and needs a lot of babysitting and before it was mainly made "so simple that any idiot can use it" - so if you were one of those people who got into it back then, you were forced to understand it more in depth merely to keep it going. Those who grew up before that simply never became familiar with it, whilst those who grew up later only ever had to understand how to the mature-stage user interfaces of that Tech, which are designed for maximum accessibility with minimum learning curve (which amongst other things means minimizing the need for deep understanding of what's going on) and did not need to know how to maintain it since "maintenance" had by then become "get a new one and click this button to migrate your info".

You can see a similar thing going on with 3D printers: earlier models are fickle and need all sorts of tweaks and understanding of what's going on to get decent prints out of them plus required frequent maintenance (amongst other things, you quite literally have to periodically retighten the screws of whatever kit FDM printer you got otherwise print quality worsens over time) whilst the later consumer-oriented products make everything simpler.