If TLS is broken, you lose all message authentication, rendering tampering entirely undetectable. Passive sniffing requires the same attack vector, and the ide

If TLS is broken, you lose all message authentication, rendering tampering entirely undetectable. Passive sniffing requires the same attack vector, and the idea of an attacker only utilizing passive attacks makes no sense. The point is that additional hashing designed for the premise of "broken TLS" fails the thread model test: It is pointless, as the only time it is applicable is when everything is fallen apart.