The MNT Reform [1] is an attempt at this. All parts replaceable and upgradable, with full schematics and design docs available when possible.

I can’t find the exact quote, but the SoC and batteries were chosen because they are expected to still be manufactured 30 years out.

Obvious drawbacks are compared to other laptops it’s under powered, bulky, and expensive, but as one review pointed out, “This is the laptop you'll need when the asteroid hits” [2].

1. https://mntre.com/media/reform_md/2020-01-18-finishing-refor...

2. https://www.inputmag.com/tech/this-is-the-laptop-youll-need-...