*> I hope this never comes to something like Let's Encrypt, so the vast majority...

> I hope this never comes to something like Let's Encrypt, so the vast majority of developers can never use this.

Let's Encrypt's response:

    I think it’s likely too early in
    this draft’s development for Let’s
    Encrypt to prioritize implementation.
    It looks like it has a ways to go
    within the IETF before it would be
    an internet standard.

https://community.letsencrypt.org/t/cansignhttpexchanges-ext...