well to call it useless assumes you know every mechamical bolt that's going on under the skin, the only reason why modurn aircraft and sea vesles ar so smooth is becase they have to operate in a fluid were drag is a concern, most of the surface of fighter jets is the shape it is simply because of this, is space haveing all this extra skin to make a ship smoother that it otherwise would actualy waists materials, what I would expect on real space only vesles would be lots of facets and details as you build the components and have armor covering them shaped specificly for those peaces but only the peices that needed it and you wouldn't care about covering the many holes between sections that you do on todays ships and planes.
now when I say ships (sea) I am talking about the bottom of them a lot more so than the top, the top of a modern battle ship is a lot more like what I would expect to find in space in terms of what it would look like. with lots of clunky details all over the place. the only thing I can think of that might give some advantage to a ship that had it's surface smoothed over would be that maybe it would reduce the radar (or equivelent) cross section.
now that said there is a certan style a game has, and you don't want to change things too much to make it no longer look like the game. if someone wants to see an example of adding in details that wernt there before while maintaining the style of the origonal, look at my htl herc model (it maintains the FS style of lots of clunky armor upon armor, not sudgesting WCS should follow the paturn shown).