> I just dont buy that bullshit that hackernews does what it should and adding features is meaningless.
Maybe it's not bullshit. Not every Website wants or needs to be Facebook. Accept the possibility that HN has its present character because it doesn't aspire to be the biggest technical social media site, that its role is to serve the needs of a particular audience of contributors and readers, with a minimum of complexity and cost.
> ... why I keep getting "this link is not available" while just casualy staying on website for merely a few minutes and clicking show next.
That's easier to answer -- any server has limited resources, and to maximize the usefulness of those resources, a session object is reclaimed after a certain amount of idle time.