I wrote a blog post a few months ago exploring the relationship between trust and Crocker's Rules. An excerpt:

I want to touch on the question of efficiency. Are Crocker’s Rules optimally efficient as a communication paradigm? On an information level, theoretically yes, as it tautologically eschews adding extra information. On a meta-information level it is very efficient as well, as the act of declaring Crocker's Rules is a very succinct way to communicate to someone else that you want to be efficient in this way.

However, there’s more to communication than information, especially when it comes to interpersonal dynamics. I talked about this in my post on feedback a few months ago. Sometimes the feedback you most need isn’t efficient. Sometimes it’s vague and hard to express clearly in just a few words, and would become garbled in the process. Sometimes the feedback is a feeling. It’s saying “when I experience you doing X, it makes me feel Y.” And this requires vulnerability on the part of the person giving the feedback, which can’t be caused by any amount of you self-declaring Crocker’s Rules. For that, you need trust.

In the short-term, trust-based communication can be incredibly slow. I thought of using an adverb like “excruciating”, but I actually find it very pleasurable. It’s just frustrating if you’re in a rush. In the long-term, however, building trust allows for even more efficient/optimal interactions than Crocker’s Rules, because you have a higher-bandwidth channel.