

They will almost certainly lead to vendor lock in. Why do you think they won’t? Apple’s password manager is definitely an example of vendor lock in. Many others have a simple to use export feature to CSV or something that others can understand
Edit: it could be that you don’t know what the WebAuthn/FIDO2 specification says or we understand it differently? Do you know how the attestation mechanism works? That ties the key to a device or software authenticator (the software authenticator is likely going to tie it to the device somehow, possibly even via a TEE).







“Difficult to recover from” was referencing setting all of your accounts back up. I should have also included “lost” and “broken” to make that more obvious. Many hardware (most? all?) passkeys do not allow for backup and restore.
But I do see an issue with stolen hardware passkeys being used for access too if they’re a primary factor. With the mitigations you mentioned hopefully holding up.