(as someone who has been meaning to write a blog forever - I will definitely like some feedback if it ever actually happens because I will want to improve and please my readers, but I'll probably take ironical feedback somewhat badly. I'll be free to ignore such feedback or silently take what's good in then, but I will appreciate if someone takes some care when sending feedback. Specifically here, "Would it really have hurt to" can easily be phrased as "I would have appreciated")
But the way you give feedback matters, and you are not entitled to be a jerk when giving feedback. Now, I don't believe OP wanted to be a jerk. I think vanishingly few people actually want to be mean. But I think the world is better off if people take their recipients' feelings in account, because it's nicer.
Another perspective: if giving feedback is indeed your intent, surely you care about the recipient and how your message is received (otherwise you would not bother). Your feedback will likely be more effective if well received, so you definitely want it to be well received. So you definitely want to avoid hurting people's feeling as much as possible (of course, sometimes useful feedback will inevitably hurt, but anything beyond this is harmful to your goal).
Whether your recipient agrees is an orthogonal concept indeed. I'm totally fine with respectful feedback given to me with which I disagree. It's okay to be wrong. (:-D)
Yes, of course! And others are entitled to ignore your feedback, downvote your comment, or say it to your face that your feedback is unwelcome, or flag your comment as they see fit.
Intentionally cryptic titles can be a good artistic choice to make people curious - but then add a summary or be kind enough to solve the riddle in the first few paragraphs.
Same with stream-of-consciousness blog posts or articles that start with some barely related story before they get to the point - but then add an informative title.
It's just that if both the title and the post refuse to tell what the article is even about, I feel like someone is purposely trying to be obscure.
I think HN, the site, also deserves some criticism here: It actively discourages people from adding any kind of context or explanation why they wanted to post a link here, so you end up with a list of just titles with no context and have to guess what the article will be about.
But if the poster isn't allowed to add context and the author doesn't want to, where are you supposed to get context from?
I think it's refreshing at this point, really. A little clumsy, not written according to "Use This One Trick To Get To Frontpage" rules, just what someone cares about in the order they wanted to tell it.