Just picking on one part of Tom's excellent note:

On 2018-09-13 11:14, Tom Herbert wrote:
....
> IMO, IETF's strength and advantage is that it focuses on standardizing
> protocols without standardizing network architecture. This provides
> all the necessary freedom for to build networks as appropriate and
> encourage innovation on many fronts. For the most part this model
> seems to haved worked well.

Well, I think we have counter-examples. PMTUD failure for one. Opaqueness
of the Internet to new IPv6 extension headers for another. The strong
desire from some operators to deploy locally-significant extensions
in a standardized way for another. And we've developed solutions
already, dating back at least to SOCKS. So haven't we been implicitly
pretending that this elephant wasn't in the room?

    Brian

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