Passkeys are highly phishing resistant in a way that passwords are not and are not subject to credential reuse (though password managers somewhat solve the first problem and almost entirely solve the latter problem.)

In effect, though, 1Password is both something you have (the device with 1P logged in, login requires a Security Key that you don't memorize) and something you know (the master password) or are (typically biometrics can be used to unlock for a period after entering the master password.)