I personally don't see the need for it to be a real window either, not only does it go against what has been established but it make no sense for it to be a real window. Someone pointed out the scene when Robau "polarizes the viewscreen." The room is flooded with light. Ever look into the sun? It's amazing everyone on the bridge wasn't blinded. Why make it a window? Is a giant monitor that can display whatever you want that much "worse" than a piece of glass/TA? Oh, and when information/communications are shown on screen it's tranlucent so that we can still see stuff outside the window. Just a bit annoying.
Seems to me the consoles would dispaly all of the information you need and there's no need for the window/HUD system, except when the captain needs to talk to someone, know what's going on right now, or needs information presented in a bold manner.
Making the viewscreen a window was dumb, IMHO.