For a lot of programmers, or at least for me, there is a mental wall that comes up whenever attempting to analyze the responses of other humans to one's own creations. Scaling that wall is not impossible, but it's difficult and draining, and the same mental effort has to be expended every time the wall is approached. I think when people are saying that Patrick is uniquely good at marketing, they're saying that for him, the wall is not there, or at least he's a lot better at climbing it repeatedly to iteratively improve his marketing.