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> they don't have BIOS checks verifying that the OS is supported and refusing to boot if it isn't

In fact the machines they're selling now almost certainly do have precisely this. It's called 'secure boot', and caused a lot of controversy. The major Linux distributions work because they've managed to get themselves signed with the appropriate key so the BIOS accepts them, but if you want to put a more niche distribution on there, you probably have to disable that check in the BIOS.

No, Secure Boot doesn't check if the OS is supported, it just checks if it's digitally signed, and that the signature is valid.

And you don't even have to disable the check if you want to use an unsigned distribution: most (all?) implementations allow the user to load her/his own public key to verify the signature against.

While we should worry about its impact - particularly in certain implementations - it's really not even close.

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