Ø Is it just that doing an additional "negotiation" within the extension body constitutes another extension point that we would have to actively defend…
Yes, the proposed negotiation mechanism is based on the premise that one shall “have one joint and keep it well oiled<https://www.imperialviolet.org/2016/05/16/agility.html>”. And it’s been pointed out that the TLS extensions are the joint that hasn’t rusted solid yet. For me, either one of the three options works (what we have currently, list of versions in an extension, or one extension per version). Cheers, Andrei
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