We could up the resolution in the PC version, as the hardware is stronger, but at the same time we wouldn't be able to do something new, like, e.g., rewriting the rendering engine that would be able to render such an amount of triangles. if we had lightmaps of interiors, the game would have looked much smoother, but in this case we wouldn't have managed to simultaneously provide dynamic lightning in an open world.
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Platform unification exists - we have a single build, which is distributed to each one of them.
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There is only one version, otherwise we wouldn't be able to make the game in time. We would have to take it all apart, and then build it and test it on three different platforms at the same time, which is impossible to do.