> HN exists to share articles
Not to argue one way or another for that claim, but assuming it were true then enforcing a no query param constraint would allow greater visibility for the shared content as again it would prevent the specified case(s) of allowing it to get buried by submissions duplicating the link. Also, it seems pointless to go against the REST standard of using path params to identify a specific resource or resources while using query parameters to sort/filter those resources; disallowing direct linking to a filter does not make direct links to articles impossible. It is true that HN itself relies on query parameters to link resources that goes against the stated REST standard.