FS1 takes place in real space. FS2 says that they take place in a simulation, but I'm sure a simulation is meant to look as real as possible. For example, in a Driver's Ed. class, when you're using a computer simulation, they make the environment look realistic. Imagine how useful (or more useless) the class would be if there was no weather, sunlight, and that off-road drives exactly the same as on-road. I'd assume the concept applies to FreeSpace as well. After all, [V] didn't change the background. I agree they'd could be nice outside of the main campaigns, but they don't really in it.