> Perhaps I need to get out more.
Another way to look at it is that you have a particular set of interests and HN is the online outlet that serves those interests. There's nothing wrong with that, at all and you don't need to have multiple sources for it. No different than someone who likes to ride bikes owning one bike, or someone who likes to read going to the same local library every week for 10 years.
Whereas, if HN closes, there is no equivalent replacement available.
I think I’m just realizing I need to find that in more places, regardless of topic focus.