Also, there has arisen a cultural moment on Hacker News that says it is useless to argue about languages. So, for instance, many of us wish to write comments that are critical of PHP. We are downvoted if we do so, and someone inevitably repeats the cant "You can write bad code in any language."
So the frameworks are much more similar than they used to be, and arguing about languages is considered inappropriate. So we end up with less discussions about tech stacks.
There are a few ecosystems that are still doing very interesting new things, such as Clojure, and sometimes you'll see articles about that. But I agree it is a smaller percentage of articles than in the past.