I have been thinking about this topic for some time, but my focus was a bit different. I wanted to know what would take to make a computer where the state is always preserved, meaning reboots are never required, but most importantly whatever you have been working with is always the exact way you left.

Somehow I think with the current culture of updates, which is linked to security requirements and ultimately to the fact your computer is always connected to the internet are fundamentally incompatible, thus this kind of computer would need also to be offline, but certainly there are tricks like live kernel updates that could be employed to extend uptime as long as possible.