I consider myself an entrepreneur, scientist, and philosopher. When thinking from the perspective of the first two, there exist very tangible constraints that must be satisfied, or at least acknowledged. In entrepreneurship, you are highly constrained by the capital, customer buy-in, and securities laws, among many other things. In science, you are highly constrained by energy conservation, momentum conservation, and entropy considerations. However, when philosophy is not subjected to many constraints, it may degenerate into meaninglessness.