Is that draft serious? "Application and protocol developers should avoid using UDP. [...] has made UDP subject to aggressive filtering at the transport protoco

Is that draft serious? "Application and protocol developers should avoid using UDP. [...] has made UDP subject to aggressive filtering at the transport protocol level." "In the case of QUIC [I-D.draft-tsvwg-quic-protocol] and other transport innovations, a new IANA assigned protocol number should be used [...]" The whole point of using UDP for QUIC and other transport innovations, is because other protocol numbers are aggressively filtered by NAT routers and other middleboxes! When you are in a controlled network, sure, you can use a new protocol number (as was done by SCTP). When you are designing a protocol to be used by end-users on networks you don't control, you have to use either TCP or UDP, or it won't work in many cases.