[thewataccount]

From my understanding they're basically an extension of FIDO?

You can just use a yubikey unless I'm mistaken?

[0x457]

Something like that, they're Webauthn alternative outside the web and allows multi-device syncing (Webauthn doesn't support syncing)

You could use any FIDO2 software or hardware key with Passkey.

[spoiler]

> You can just use a yubikey unless I'm mistaken?

Yes, USB passkeys work!