On the west coast it's mostly a matter of things arising from chaos. You do what you can in terms of nailing the logistics (pizza, beer and fast moving lines) but the meat is who you get into the room, not what the person at the microphone is saying.
I'm not saying YC and pg couldn't have made it better, the OP should be lauded for some of the critique. (Criticism of YC tends to be controversial.) But the OP seems to have accidentally discovered exactly some of the differences between east coast and west coast cultures.