I have definitely noticed a large influx of posts which are basically blog posts posted to HN. No questions, no links, nothing shared, just... someone posting a few paragraphs of their own thoughts. So while I've been around long enough to know that eventually the community tends to settle into its own norms... things have felt different recently.
None of this answers your question, so this was a lot of words to say, "I don't know, but am interested in the answer."