this post was submitted on 03 Oct 2023
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It is encrypted, just not all of it. Back upon a time all of it was encrypted but it created a problem. It was impossible to host multiple different domains on the same IP over HTTPS because chicken and egg: couldn't get the domain from the host header without completing the encryption handshake, but to do that you had to know which domain's certificate to use.
To solve the problem they came up with a TLS extension called SNI that indicates the certificate during handshake, but does so by pulling the domain name out in the clear.
ECH aims to encrypt these parts left in the clear, but can't do it with the TLS certificate (chicken and egg above). So they resorted to the encryption used by DoH instead.