Why is the author so concerned about the laptop getting stolen? Even if you know nothing about GPG, your laptop should be encrypted. Even if you somehow can't u

Why is the author so concerned about the laptop getting stolen? Even if you know nothing about GPG, your laptop should be encrypted. Even if you somehow can't use full-disk encryption, your private key should be protected with an equally strong passphrase. The thief gets nothing but a useless chunk of base64-encoded blob. Now of course this doesn't mean that subkeys are unnecessary, but the author should probably find a more realistic threat model that readers who are already privacy-conscious can more easily sympathize with.