You don't write things down anymore. I very much do not have the option not to write things down. I cannot remember my ass or my elbow without writing things down. Having ADHD just be like that sometimes.
But I'm gonna also say that a lot of it is about scrolling media that's visual instead of written. If you watch tik Tok and post photos or scroll photos instead of content where things are written and require other people to read, you get stuff like this.
When I was a kid there was a poll about what kind of books kids liked to read. An overwhelming majority of those kids selected that they did not like to read (and this was before full fledged internet service in every home and cell phones in every pocket).
So you're right that you don't get better at what you don't practice, but I think there's more to it than "people don't write things down anymore".
Your car probably has an electronics module (ECM) and a power train module (PCM) at the very least. But there's very few cars built in the last 3 decades that don't have at least two computers in them of some kind.
Obviously that's not a "data center on wheels" but I hope this headline is hyperbole.