> And most sites only allow one passkey per account because all the mobile implementations can sync the private key. Even when/if sites do allow multipe passke

> And most sites only allow one passkey per account because all the mobile implementations can sync the private key. Even when/if sites do allow multipe passkeys per account, the fundamental contradiction remains: Your backup key(s) are supposed to be kept somewhere secure where they won't get lost, stolen or destroyed, which ideally means some sort of off-site backup (at your bank or whereever), but at the same time every time you register for a new service you do need to register all your backup keys, too.