I agree skyline has many good features!

Its not a bad game but if people demand more realistic simulation to 100% it might take a long time before you can see building with higher polygon count and higher textures.
cause it be a night mare texturing each and every single polygon with just one UV map!

With such a complex building as shown above!

if you had very low polygon count it wont be a problem but still i have not seen buildings in skyline like the shot I have shown. This is an in game shot.
The more complex a building the more annoying UV mapping would be.

So having the ability to use as many moddeing features to make your building will help the visual. But its not the number one issue to have it just looks nice.
