Re: [quicwg/base-drafts] Fix congestion control permissiveness (#3248)

[hardie <[e-mail]>]

Jana, can I read your reply to Ian as "I agree, but there are no MUSTs we want to include, since the SHOULDs is BCP145 are the best we can do"?  If so, maybe the right thing to do is close this issue with just the more precise pointer.  I do believe, however, it would then be better to recast the sentence to make the pronounce/antecedent clearer.  For example: 

If an endpoint uses a different controller than that specified in this document, the chosen controller MUST conform to the congestion control guidelines specified in Section 3.1 of
{{!RFC8085}}.

There are other ways to phrase it, of course.  That would alleviate my concern that a naive reader might believe that they could roll their own behavior; that's particularly worrying when the very first item in 3.1 allows this:  

  If an application or protocol chooses not to use a congestion-
   controlled transport protocol, it SHOULD control the rate at which it
   sends UDP datagrams to a destination host, in order to fulfill the
   requirements of [RFC2914].

It's all too easy to read that as allowing simple packet-pacing to suffice for QUIC here.  If the reader knows that they have to pick a known congestion controller, we'll be better off. 

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