Have you seen framework? Those are not half bad. The modularity is mostly with the ports, but most everything is replaceable and upgradable. Not perfect by any means, but taking that approach doesn't have to mean the laptop has impractical tradeoffs.

If the lasers were accurate enough, it would take a long time if ever. Evolution can only happen if there are survivors. No survivors have a less chance of beneficial mutation. Of course the weeds come from somewhere, so not zero chance.