There is no innovation in blocking payment providers from access to iPhone’s NFC hardware.
And there’s no truth to it being necessary to ensure that Apple Pay is secure.
(Tokenisation and cryptography make payments secure, not NFC itself, being a very insecure means of wireless communication)
Also, preventing developers (or competitors) from deploying their own solutions on widely-deployed hardware doesn‘t incentivise innovation. Especially not when the applications (NFC payments) are standards-based.