Given this is actually relevant to the article and not meta, we can
actually talk about the "turning into slashdot" meme without it being off-topic. It of course is impossible to really quantify how much HN is like reddit or slashdot (or what remains of it), but on relative terms, it's still easy for me to see the difference. You still have much fewer "meme posts" and worse meme threads. I admit this is real nerdiness here, but I favorited this thread years ago, preserved in amber, for you to see[0]. You can still tell it was heavily downvoted. Anyhow, even still, these kind of "meme threads" which pervade reddit just aren't that common here at all even today, usually being snuffed out before they're even started. So, even now, certain ticks that are common across the internet are still discouraged here.
I think one thing that has changed over the years is more acceptance of one sentence replies as long as they uphold the median political perspective. Things like, "this is terrible, how can this be permitted" used to get downvoted more (a lot, in fact), while I see some make it through the cracks lately, as long as they somewhat express a thought. Other than that, not much has changed. I can only say that being on HN so long makes you realize that there are memes and political groupthink here too, it just takes different forms or can be obscured somewhat by the longer more written out comments.
[0] https://news.ycombinator.com/item?id=7141357