Passkeys are a little different - at heart, you can export or write down (on paper, if it comes to it) your passwords, and then import them into another passwor

Passkeys are a little different - at heart, you can export or write down (on paper, if it comes to it) your passwords, and then import them into another password manager if you choose to. If you want to move from the built-in keychain to 1Password, you can do an export/import operation, and have your passwords in 1Password. You inherently can't copy-paste a passkey, since it's an asymmetric public/private keypair authentication. These keys are (usually) decrypted by a single symmetric key that you protect well. If you allow that key to be exported, you're back to "one password for every website"! When this is done on a hardware-protected security engine (which doesn't permit any extraction of the key), it's arguably quite secure, but you don't then have any migration path.