If the purpose for you is to get a dopamine hit and not true interest (exaggerating here) it might tune you out from the matter at hand.
For me it is the aspect of a more eclectic crowd, with a host of opinions, yet often still respectful that I like. Most threads give insights that are lacking in more general, less well moderated places. You get more interesting in depth opinions and knowledge sharing what makes HN great to me.
Dare I venture back to 4chan and see how my detoxxed brain sees it now...
The value of a community is in the unpredictability and HN has a good percentage of that, and I can choose to ignore the threads that will be predictable (though it can be fun to read them sometimes).
But in general I agree on its predictability.