I think that goal only works when the community is small and culturally homogeneous and the velocity of content is relatively slow, but all of those result in implicit silos at scale. People's subjective experience of HN already differs wildly from others based entirely on when they show up, from where and what kind of content they consider on topic, and it already creates a great deal of tension and hostility.

Plus, HN's design makes it easy for a single story or kind of story to appear to overwhelm the forum (I say "appear" because really there's more than what's on the frontpage, but most people never bother to check past the frontpage,) which only results in complaints and threads like this. Another layer of organization to handle HN's increasing scale and complexity might be necessary.