Why is it not possible, exactly?
being hackable means exactly the opposite of stability: you can change low level features and break things. if there is a chance to do it, people can be tricked to do it. of course, i'm excluding here people who have knowledge, as i continue to belive that they are a minority.
Yes. On my laptop, Linux is extremely stable, and yet extremely hackable. What, Linux doesn't work for you flawlessly? 99% chance it's drivers, which has nothing to do with stability and everything to do with the limited amount of effort that people have poured into drivers on that particular platform.
> being hackable means exactly the opposite of stability
False. "Stability" implicitly means "without modifications". There's no product or (human-made) system in existence that remains stable once you start making arbitrary modifications to it.
> if there is a chance to do it, people can be tricked to do it
Yes, and "freedom" (which is a core tenet of the United States Constitution, where most HN commenters are based) includes the ability to do things that will hurt yourself. "We know what's better for you than you do" leads to tyranny the majority of the time (as it does here, where Apple has full control of their devices and regularly makes decisions that hurt their users).
Moreover, it's relatively easy to design a system that prevents the vast majority of users from shooting themselves in the foot (by making root(-adjacent) access difficult to acquire by accident and fairly difficult to be tricked into doing), and coupled with actual education would keep the levels of this particular kind of computer fraud (where someone convinces you to bypass your computer's security features) well below the rates of other computer fraud (such as falling prey to scam emails).
Any computer with preinstalled Linux will "just work". Typical users will only install apps from the repositories, and those are more secure and private than App Store.
ChromeOS is a similar story - even more so, actually, given that it can run a full fledged Linux distro within the system.
there are options for everyone, if you want to hack it, good, there's android for that. there are even phones that you can customize. if you want a stable black box, there's ios, this is well known before you buy it. there are options for every one of us...
i think you guys forget that this is an echo chamber and the real users out there are not tech savy. i