You mean that we shouldnt see colored clouds obscuring visibility? I honestly dont know.
Actually its impossible for us human beings to see nebulas at all. The colored images we see are visualizations of the nebulas' electromagentic fields, captured by special lenses with different filters applied. The wavelength of those waves are invisible to our eyes.
Nevertheless, those processed nebula images are really nice to look at, and it can be made plausible to see them within the game if the official statement were that the ships windows automatically apply certain filters so we can actually see them.
But a visualization like in freelancer is far away from realistic. Its beautiful, but not logical. Nebulars are no "cloudy entities" as we imagine them to be. But IMO it doesnt always need to be scientifically correct. Those are games for our dreams and imaginations, to feed our urge of exploration and seeing things we usually cannot in the current state of technology. Some "fantasy" can be allowed, as far as I am concerned. Just like the FSD which is purely fictional or even entirely impossible like shown in ED, which has even been said by FD themselves.
Just my 2 cents tho.