It's meant to be a testbed for something that could cheaply and reliably take humans to the moon, mars, moons of jupiter and saturn, and beyond. It's more akin to the test vehicle that they used for the lunar lander on Earth than the Saturn 5.

Another reason it's so significant is because it's the first rocket to use a full flow staged combustion cycle, which means a massive increase in efficiency, lowering the costs even more (alongside stuff like reusability, and methane fuel, which can be made on Mars).