It's good you brought up cars, as they're a perfect example of conflicting needs. Cars are now computers on wheels, and while I'd love to drive a car I personally modded at firmware level, I would also be against allowing such cars on public roads. One, hackers make mistakes, and two, malicious actors would trick regular people into modding their cars to further their malicious goals. Both reasons create public hazard. Which is obvious in case of cars, but less obvious with computers connected to the Internet.
At this point I fear we might need to fork computing entirely - let the regular users live in "hell" of propertiary, locked down services they don't actually own, while ourselves, we get the "heaven" of free software... that's pretty much not allowed to interact with regular users. I don't see how to keep the two worlds as one, because all features meant for hackers can also be used by malicious actors to pwn people.
Consider e.g. dev console in a web browser. All is cool, because regular users don't know what F12 does and wouldn't even think of pressing it. But then Facebook and others have to put Self-XSS measures into place, because a malicious actor can tell a regular user what F12 does, and how it "can" let them see who viewed their Facebook profile...
I hate the idea of split world. It means I won't be able to e.g. automate my banking or pizza delivery, because those things will have to go through "dumb" computing, to avoid self-pwnage risks. It means that eventually I won't be able to even get a general-purpose computer, because the nature of niche markets is that they generally don't get served with good stuff at accessible prices - they either get served at exorbitant prices, or don't get served at all.
So I don't want that split world. I want an alternative to fight for. But as I previously wrote, I can't see any.