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I have one of these, they are just as durable as an actual laptop. Even more so, as a matter of fact.

Any bump severe enough to significantly damage a micro PC would also be enough to crack the screen or otherwise damage a laptop too.

Shock resistant, dustproof, etc. industrial computer modules do exist but you'd be paying something like 10x the price of an ordinary computer so it's not worthwhile.

Because not many people carry a PC, monitor, keyboard, etc. around. We have laptops for that. You can get a sturdy case like a Pelikan if you want to protect it.