I spent most of the past five years working on projects for the US geointelligence enterprise where if we failed to meet a deadline, a satellite might not launch. Before that, I was in the Army for 8 years fighting wars. I am perfectly willing to make tremendous sacrifices when it is actually worth it, but it is amazing to see how deluded Silicon Valley types are about the actual importance of what they're doing. Not everything changes the world. Most products are trifling conveniences, nice to haves, and if you miss a deadline here or there, nobody cares. Or at least they really shouldn't care.