I think the intent of the ASGCA code of conduct was to avoid critiquing other architects negatively as part of your own sales process, just to keep it civil. If they felt the need to do that in 1946, then things might have been even more cutthroat back then than now!
The problem lies in the fact that something I say or write right now critiquing another here could be used at some point in the very distant future. As you know, indictments are always front page news, but when the prosecutor admits he wrongly charged someone, that little tidbit shows up on page 21, but the innocent man is only remembered for the indictment.
There are other good reasons to limit critiques of others, including the golden rule, the fact that you can't learn while talking, and few criticisms do or can consider the many factors that go into a design decision. I think some of you overvalue the the learning that comes from critique. Specifically, how does a one paragraph Doak review (often based on a one hour cart ride) ending in giving my course a "4" (or whatever) help me improve as an architect? All I really knew was that some aspiring golf architect thought my courses weren't as good as Sand Hills, and frankly, I already knew that before ever setting foot on SH, and figured that if I wanted to build better courses, I needed to get better sites!
I have recieved and given some critiques from/to other gca's in private for very specific matters, and always after an honest question has been asked. These have helped me, while for other gcas, maybe mine not so much, I don't know.
A few have made me question long held assumptions, which is good.
Generally, I learn more from seeing work of other gca's than I would hearing them talk negatively. So, as far as me learning anything, their time is better spent doing good work than critiquing the work of others. And that works out better for them, too!