You can't "crush code" and build a space elevator in a hackathon.
You can't hustle your way through a robot that collects, folds, and stores all your dirty laundry.
You can't build an O'Neill cylinder with a 2-year horizon of profitability.
Some problems are hard, expensive, and do not lead to fame or fortune in the short term. Startups are not structurally equipped to solve these problems, and perhaps public corporations aren't either. As it turns out, it is much easier to make money by solving (or inventing!) easy problems, and our culture currently views making money as a proxy for creating value for society. If you want a more exciting and ambitious future, we will all need to think further ahead than the next quarterly earnings report.