It's uniquely SV only for those who spend all their life in SV. Go to NYC, go to LA, go to London, go to Tokyo, and you will find very ambitious and driven people working hard on their acting/band/fashion label/non profit/etc. Those people also tend to be way more open about the forms creativity other than their own takes, whereas the SV techie entrepreneurs tend to think that anything other than changing the world with a billion dollar startup is a waste of time.
Which is why on a personal level, after about a decade in SV, I'm very much looking forward to leaving soon, having realized that ambition, fulfilment, and impact can be realized in ways other than yet another iOS or rails app, and am getting tired of the monoculture.