Balconies are part of the deck space anyway and not counted (fully) to the GT. Of course the older generation of liners look often (not always) better. But on the other hand large windows allow good views. With a porthole one must always go to the window, when willing to look outside. What's the design of future? The British Virgin Group is building a couple of cruise vessels and they look even more futuristic. You find the photos in web. With smaller vessels one finds a variety of designs. A large number of "yacht size" vessels are entering the markets in next few years and there are some remarkable designs.