I agree that U2F/webauthn/FIDO2 is superior (in terms of security and in most cases convenience) in basically every way. This is an alternative approach that is

I agree that U2F/webauthn/FIDO2 is superior (in terms of security and in most cases convenience) in basically every way. This is an alternative approach that is less secure than webauthn but a bit more secure than regular number matching or enter this code 2fa.