How many people cared about those schematics? Most people would say "Gee, instead of this paper of things I don't understand, having a list of the radio stations in this spot would be more useful"
As someone who found computing in general through the joy of taking broken electronic things apart and trying to fix them, it does sadden me too when I see a black blob over a circuit board but most people are just happy they're cheap and easy to replace and toss em away. Most developers I know today can't understand basic electrical circuits, even though they are the very foundation of everything we do. But like my previous analogy, most would rather just see the magic happen when they install something, write a little bit of code, and see results.
Some of us do value privacy, security, and even the underlying things that make stuff work. We're in the minority. The vast majority of people simply don't even care. I've tried explaining it to my wife, or my mother, that some piece of software might track them, know about them, restrict them, whatever, and the opinion I usually get back is "Oh, it doesn't already do that?" People joke about Facebook ads being something they just talked about all the time and it doesn't even phase them that the reality is very near to that.
People simply don't care enough to make a change in the laws that would prevent things like this.