Nit:

> NOTE: The Note Well has changed.  It now incorporates more legal 
> verbiage around IPR disclosure.  Everyone should review this.

The slide shown in the WG seems to be out of date compared to
https://www.ietf.org/about/note-well.html, but the substantive
changes aren't in the Note Well; they are in RFC8179.

More substantive:

> - Andy Bierman: our review process discourages people from implementing
>      early.  Once it gets to the AD and the IESG, they can change
>      anything they want.

If a reviewer or an IESG member suggests a substantive change,
that doesn't give *them* the right to change it - a substantive
change must be brought back to the WG. So the underlying problem
here is not about who has control but about the fact that
implementing on the run almost guarantees that your implementation
will be out of date when the thing is finalised. That really is
not specific to yang, or to the IETF, or to networking.

(In 1925, public electricity supply in London was at 24 different
voltages and 10 different frequencies. They didn't wait for the
standard to be final then, either.)

It seems to me that declaring snapshots from time to time is
about the best we can do, accompanied by a strong warning that
the final version will be different.

    Brian

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