I've worked with the IETF on several RFCs. I'm also familiar with the challenges that the Tor project faces daily, and what they have to do to stay ahead of the entities trying to break Tor. I think for Tor to even stop to talk to the IETF would be an waste of their time; Tor needs to be nimble, and the IETF standards process is painfully, horribly slow and unable to move quickly on anything. Given that Tor releases updates on a cycle that is shorter than the normal time a draft spends in the AD review queue, by the time an RFC got to the standards track it would already be out-of-date.