Honest question - before you complained, did you make any effort to understand the origins of Hacker News, and why it exists? Before stomping on a flower, you might endeavor to understand something about the soil it sprang from; as well as whether it is rare or common, and what nutrients it needs. If you do that, you will understand why HN needs startup posts, but probably not you (or me).

HN exists to serve the needs of a specific startup community. There is nothing wrong with this. If the flowers bring forth fruit that can entice we who do not have the needs of that community in mind to eat it, and spread the seeds, fine. But asking the organism to bear forth, say, twinkies, is a waste of time.