Good point, corrected my post. My point isn't "don't worry about scaling" (in fact, large scale distributed computing is pretty much my own area of expertise/in

Good point, corrected my post. My point isn't "don't worry about scaling" (in fact, large scale distributed computing is pretty much my own area of expertise/interest). My point is that there's a lot of glory stories of grand technological challenges, but they do not occur at your typical early stage start-up. If you want to solve these kind of problems, you're best off joining a company that's experience them (and not joining an early stage start-up and wishing they would: been there, done that).