As a long-time user I’ve seen the most change around “What to Submit”:
> Off-Topic: Most stories about politics
> If they'd cover it on TV news, it's probably off-topic
The guidelines haven’t changed but it feels like the enforcement of it has.
For example, the US government shutdown is currently on the HN top 20: https://news.ycombinator.com/item?id=45434146
While a mainstream newsworthy story, I fail to see how it “gratifies one's intellectual curiosity” or is “Anything that good hackers would find interesting.”