So given the right artistry, gs script programming and sound resources, you could recreate the same level of realism, atmosphere, size of perceived world of these games with GS?

I was also curious how GS works with 3D hardware. I was under the impression that processes from vertex transfromation to rendering was done via DirectX and and the card hardware. I am sure entities and world geo are handled differently, but for entities for example, how does the pipeline play out? Probably not the best forum for this, always been curious tho.