and/or "overly chattiness" would be harmful.
That's implementation defined.
Chattiness should be defined in terms of the protocol
and the operations they perform. Not only should
protocols be designed to avoid overly chattiness,
where the protocol implementation allows for
chatty protocol exchanges, the specification should
discuss chattiness issues and state appropriate
imperatives.
The LCUP I-D makes some statements in this area, I believe
more is necessary and will over specific suggestions
at a later date.
Sure, add implementation advise, but you can't mandate against