Space x starship is nothing more than a tin can with the engine underneath.
there are technologies that could save a lot of costs to get out of the earth's atmosphere. such as the space elevator that would transport astronauts to some kind of outpost in space or spaceport.
I think that if humanity wants to conquer space, ships should not be built on earth but in space where there is no atmosphere, only in this environment can you reach and develop new experimental technologies to attempt inter-space travel.