That's a really interesting point. As much as I've generally enjoyed the quality of front-pagers on HN over the years, I am now wondering about all the really good stuff that never made it there -- whether because the posters didn't optimize the timing properly, didn't game the headlines, or simply posted material that took awhile to digest and sink in.
Overall, there's probably a strong correlation between material that makes the front page and material that this community considers upworthy. But timing plays a huge role. I wish there was some way to counterbalance the effect a tiny bit. I can think of a few -- most of which would, unfortunately, be just as likely to harm as to help the reading experience.