What people maybe don't realize is how many constraints there are on HN's system. There aren't many degrees of freedom for us to change things that wouldn't lead to a massively different site, and most of those outcomes would be worse, because most of them would be closer to internet default.
It's easy imagine "HN, but without the things that I personally find annoying". But try to generalize that for a moment and the problem quickly becomes intractable.