Why would you choose that over a synchronizing passkey manager?
A third party OAuth provider puts you at the mercy of the service provider, the other can work fully on your client side even if the app provider were to disappear tomorrow.
The only advantage I can think of is that you have a centralized place to revoke credentials in case your password manager does get compromised.
"A third party OAuth provider puts you at the mercy of the service provider" This is they key issue with trusting a third party to manage my passkeys, they can also BLOCK them and lock me out. An exception is if the passkeys are synced to all your devices and cannot be remotely wiped. I think this is how Apple works.
> Why would you choose that over a synchronizing passkey manager?
No second factor, compromised passkey manager leads to compromise of all accounts. This is a huge problem.
> A third party OAuth provider puts you at the mercy of the service provider, the other can work fully on your client side even if the app provider were to disappear tomorrow.
Yes that’s what I was saying, it needs some thought and careful work. It would need to be decentralized, and I’m not sure that current standards are up to the task.