All of that is very true, plus there is one more huge advantage. Everything in space is currently designed for launch loads. Strapping something to the top of a

All of that is very true, plus there is one more huge advantage. Everything in space is currently designed for launch loads. Strapping something to the top of a rocket puts massive stress on everything - even small things, so they have to be overbuilt relative to the loads they experience in space. Manufacturing things in space (3D printing or other technologies) allows building the minimum required part for space. Imagine how much smaller and lighter simple things like equipment mounts could be if they didn't have to survive launch.