Why passkey login to 1Password?

If you are requiring a second factor for passkey login (which I did not think was a thing), then why not use the Secret Key? Email makes no sense, as I have lost access to email as I cannot get into 1Password to get my email password.

I thought the idea of passkeys was that 2FA is already addressed as to access the passkey, you have to biometrically authenticate to the passkey store. So why the added hurdle for 1Password? It seems at odds with the whole idea of passkeys.

My understanding also is that passkeys cannot be stored outside of a designated passkey storage platform for security, as biometrics or other 2FA are required. So how do I get into iCloud Keychain or Google Password manager without access to 1Passowrd to login?

This continues to look like a circular problem with the result of being locked out of 1Password if I lose all devices.