2007-2012: The first 5 years everything was new and cool and shiny and we were just going thru the economic crash.
2012-2017: growth and scaling. Slightly more political posts, but that's mostly because tech and politics mix a lot more then the previous 5 years.
2017-present: stabilization. An even mix of similar articles, voting sentiments, repetitive opinions. The main thing missing is actual NEW ideas. We get tropes on "AI will rule the world", "10 reasons we need universal basic income", "why self driving will/will run the roads in 5 years", "FANG is evil", etc... all very predictable dicussions.
The revolution will not come from Hacker News : )