Effectively, there is only a single usable Internet protocol, called TCP. There is only two usable ports, 80 and 443. There is only a single usable transport-layer protocol, called SSL/TLS. And nothing more.
Luckily, Tor relay operators have recognized this problem from the beginning - Tor uses standard TLS for the transport-layer encryption, most of the relays are running at port 443. It enables everyone to bootstrap them to the complete version of Internet. And recently definitely IETF is well-aware of this, hence DNS-over-HTTPS.
