I admit that I'm not intimately familiar with YC's and pg's preaching but my impression of what I've read and seen from pg is that he is very insistent on startups having a solid business model and on them focusing on customer acquisition. And I don't remember having ever heard pg advocate quick exits. This is at odds with the assumptions you've based your post on. I might be wrong though - happy to get corrected by YC alumni.<p>As for "changing the world", this is an expression that's as meaningless as it gets. Of course everybody wants to change the world, why wouldn't you? And since everybody lives in their own world anyway, in a way, everybody changes the world. For example, I personally find Facebook to be one of the most useless product I've ever used. I genuinely wouldn't notice if Facebook disappeared tomorrow. On the other side, for my deaf teenage cousin, Facebook literally changed his world. He went from being the weirdo disabled boy in the corner of the room that nobody would talk to to being a perfectly normal teenager communicating on Facebook like any other teenager.<p>So the YC startups you're talking about might not have changed your world but you can be sure that they've changed quite a few other people's world. Arguably, Steve Jobs, who you cite in example, has hardly changed the world for most people. Had he not be there, computers and smartphone would have been there anyway and would have more or less done what they do today (and I'm saying this as a big admirer of Apple who has discovered computing on a Mac SE and is typing this post on a MacBook Pro).<p>When it comes to bigger goals like ending wars or poverty, fixing the global warming problem or space exploration, it would be incredibly naive to believe that you can tackle the problem as a nobody (i.e. as a young, first time entrepreneur with no cash and no network).<p>Elon Musk didn't start with a crazy-big-truly-change-the-world project. He, you know, did Paypal first. Just like what the Stripe guys (a YC startup) are doing. Bill Gates didn't start by tackling the issue of poverty, illnesses and illiteracy in Africa. He started by writing an interpreter. You have to start somewhere and this somewhere is generally relatively small but gives you what yo need (knowledge, experience, network, cash) to follow up with something bigger afterwards. That's my understanding of what YC is all about.