a) that's feedback

b) it's useful in a comment thread like this so people can quickly see what the 'caveats' mentioned in the title of the post are

Feedback in a forum stating something the developers are probably well aware people want in a location the developers might not even be reading is not particularly useful feedback. As for the comment thread utility, sure, I guess if you think that not reading the article is valuable for the HN community, but I could just as easily argue that pushing back against comments like that could be seen as valuable for a community that values more thoughtful feedback.