"Please don't complain about website formatting, back-button breakage, and similar annoyances. They're too common to be interesting. Exception: when the author is present. Then friendly feedback might be helpful."
Appreciated! These things genuinely are super annoying, which is why we need the rule. It's about foregoing a local optimum (justified but repetitive criticism of flaws in web pages and software) for a global one (more interesting, less predictable conversation).