There is only one Steve Jobs. The rest of us are better off talking to customers first. That thinking (transformative idea... which generally amounts to nothing more than 'X of Y'), is why most startups fail.
True, from a numbers perspective most startups are a Y (in an X of/for Y) but every once in a while someone becomes an X (Uber, Airbnb, Dropbox) and that’s what’s exciting about reading a “Show HN” for me.