Falcon 9 (spacex's other rocket) wasn't human rated at first either.
The point of starship is to reduce the cost of kg to orbit, by being a fully, and rapidly reusable launch system.
The other long term and loftier) goal is to enable Mars colonization, a mission who's current main blocker is cost of kg to orbit.
By reducing the cost of putting things to orbit, you can do a whole lot more. Starlink is a good example, but if starship works it will be a paradigm shift that will result in a whole new space economy.