There actually used to be a every Sunday workshop where you made one from scratch in 3 hours (including board fab) with a grab bag of components to populate with — within the past couple years. (That shop closed due to lack of patrons.)
You can’t modify simple electronics as easily — but how many people built their own drones in the 80s? I’d guess RC cars and drones have about the same number of DIY whatever, and that we’re not seeing a fall off (because of difficulty — availability and community are different issues).
The simple truth is most people don’t care and don’t want to manage their stuff all the time: I make my own electronics, but my laptop is still Windows with minimal config. My desktop is parts and Linux — but only because I needed it to mirror what I do at work, as a test bed. The company itself found data centers to be too much fuss, and lifted-and-shifted most of it to the cloud.
Why don’t I bother? Because fighting the laptop constantly to keep FOSS working (and secure!) detracts from my time building my own electronics (or other forms of living life).
If you really care, our failure to create broader technical skill is not technical: it’s social.
We allowed RadioShack to be gutted, we allowed ”hacker spaces” to be priced out of business as cities grew, etc.