"Device attestation is how you can use private keys you don't actually have access to."

Read that phrase back and then ask "is this the future of computing that we wanted?"

The likes of passkeys, essentially user-hostile ssh keys that live on your device but aren't accessible by you, would have been an unbelievable dystopia to us in the 90s.

"Linux folks need to implement the full stack"

Nah it's fine thanks, I'd rather opt out of corporate serfdom than compromise my principles.

That's just your opinion. Has nothing to do with Linux. And yes I would like a device like a soldered in tpm device that can generate private keys and verify signatures signed with the public key. Your misunderstanding of the technology not withstanding it does appear to me to be quite a valuable technology since it's in basically every computer these days.

Stop speaking for Linux.