This is what I struggled with after grad school. You have so many decent ideas. So many people you know in the domain also with their own good ideas. Everyone looking for their next gig. It could all be so easy to get a couple people together and start building. But, alas, money, that must come from people who expect more money back before long, which severely limits the scope of ideas that will get investor funding. No moonshots, no sci fi future, just same old looking for low hanging arbitrage or rent seeking opportunities. Kinda sad when you realize that is pretty much all private tech investment because funding is driven by investors ultimately, and not scientists like what you see on grant review panels for basic research. Money must make more money, which again limits severely what money can do.