It was my understanding that the text of this letter was already agreed by the CWG. In any event, I find the tone of the letter unexceptional and fit for purpose. This is a "letter of instruction" which needs to clearly state that ICANN will act at the direction of the Names Community, so avoiding the terms "instruction" and "direction" would be counterproductive.
I think that the IANA IPR agreements are quite clear that they cannot be used as end-run around the separation procedures; I don't think there's any need to state that here, particularly because paragraph 5(e) exists only to state that the CCG and not ICANN will provide any notices under Section 5(e).
It's not necessary to define CCG here as the letter states "Any capitalized terms used but not defined in
this letter agreement have the meanings set forth in the Community Agreement." That said, I can see from Steve Crocker's note that it would be preferable to define CCG here, since it is an important term to understanding the letter and we certainly have enough other definitions in the letter anyway. So I would support changing the letter to do that (if it can still be done at this point).
As for the bigger picture, I do agree that there should be guidelines for the names community CCG reps, and (separately) procedures for the activities of the CCG. (IETF and RIRs will want to draft their own procedures for how they deal with their reps).
Greg