Thanks for the answers.  Some minor notes:

________________________________
From: Nick Sullivan <[email protected]>

>> If Proxywerks is serving other origins from the same IP addresses, and wants 
>> them to be indistinguishable from ECHConfig Foo to an attacker, why doesn't 
>> it just give those other origins ECHConfig Foo too?

> In practice, some customers disable ECH for various compatibility,
policy, or operational reasons.

Would such customers be willing to share an IP address with Signed ECHConfig?  
If they have opted out of ECH, it seems likely to me that they are not willing 
to be part of this "alias set", regardless of the technical mechanism.

...

> The claim is narrower: TLS should not
unnecessarily preserve an easy SNI-based classifier when that
classifier can be removed.

I do quibble with this: we should not be writing RFCs based on a general 
principle of this kind, even if it sounds like a worthy principle.  We should 
also know of some class of deployments that we believe would be willing to 
deploy the new design and able to benefit from it.

--Ben
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