The main vulnerability isn't the man in the middle per se. Rather it's the unforgeable attestation of exactly what software an end-user is running, by the user'

The main vulnerability isn't the man in the middle per se. Rather it's the unforgeable attestation of exactly what software an end-user is running, by the user's own hardware having been designed to betray the user's interests. This would allow powerful websites to prohibit the use of user-representing agents altogether, and essentially mark the end of the open web.