>considerably worse place if everyone abided by such rules

Those rules are not meant for everyone.

That's the theory, but there's absolutely normative statements in this piece. For example:

> When you spend the first third of your message establishing that you are a nice person who means well, you are not being considerate but you are making the recipient wade through noise to get to signal. You are training them to skim your messages, which means that when you actually need them to read carefully, they might not. You are demonstrating that you do not trust the relationship enough to just say the thing and you are signaling a level of insecurity that undermines the technical credibility you are trying to establish. Nobody reads "hope you had a great weekend" and thinks better of the person who wrote it, they probably just being trained to take you less seriously in the future, or at worse, if they're evil loving of Crocker's [sic?] like myself, they just think about the couple of seconds of their life they will never get back.

This very much sounds like the author believes that everyone who doesn't abide by these rules - not just him, not just people who've agreed to them, everyone - is deficient in some way. And it's not just a slip - this attitude is pervasive throughout the post.

The blog post is an open letter: the author wants everyone reading to follow the those rules.