This seems like a more recent addition, though I don’t agree with it. I personally value such comments and avoid the sites in question. And the more the people who write about it and avoid those, the better.

I wouldn’t have known about this new guideline if I hadn’t seen your comment above.

>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.

I understand the motivation (it doesn't encourage discussion about the topic at hand), but like to see these criticisms both as a warning before visiting the site and to know more about what things really bug other users and sites that may help quantify them.

I also avoided sites with (helpful imo) comments that the site did things like breaking the back button, or blocking full screen popups.

archive.org suggests this was added on 27th June.

Perhaps there should be Some rule against immediately chastising people for rules that have just been added.