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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.

your kids will be fixing your 3D holographic projection glasses or some shit like that dont worry

It's worse than that: we're a small subset of the only generations that know how computers work. The vast majority of my peers would balk at using a command line, much less anything deeper.

I say generations because it's obviously not limited to one, but, it sure as fuck isn't many.

When I was six years old, my dad brought a computer home from work. It had Windows 3.1 on it. I had to learn how to use the DOS command prompt in order to play my favorite game, Q-bert. When I was a teenager, a new computer of middling quality could run north of $3000 from the Best Buy. But my friends introduced me to a catalog where I could buy the parts to assemble one from scratch. They let me borrow their copy of Windows 95 to install. Then we all had to learn how to use dial-up in order to connect to the internet, or how to build out a LAN network to play games together in person. We took classes in touch-typing at school, using the computer lab. I went to computer camp during the summer. I went to college and took more advanced classes on programing.

I have spent tens of thousands of hours learning to use the computer, practically from the inception of the PC to the modern day.

Now my friends have kids, and I talk about how they use the computer. Everything is out-of-the-box. Installing something is as simply as clicking an icon. You can buy a mini-computer off the shelf for under $200 and it runs better than anything I could have built thirty years ago. Periodically, they will come to me with a more advanced computer program, which has to do with a very particular OS configuration or some weird networking bug that only someone with 10+ years of experience would think to look for. I typically find the answer online, because I don't remember it off the top of my head. I teach the kid and the kid learns, and then the kid knows as much as I do on that particular subject.

In twenty years, I'm sure they'll know more than me, just because I'll be retired and they'll be in the thick of it.

Also, please nobody ask me how a car works. That was something my parents' generation learned. I'm clueless.