Steinberg please take some notes from other software interfaces. There is a lot that can be done to take the current interface of your products to another level.
2 products off the top of my head that have a great interface:
The brand new Ableton Live 9. It can go full screen, looks incredible and is most importantly fun and intuitive to use.
Adobe CS6. All of the applications go full screen with all the windows being able to snap in place or move freely on the screen.
Having floating windows is fine for opening vst instruments and effects but the core functions such as the transport, mixing window, vst instruments etc need to be incorporated not as floating but as built into the interface.
There is a lot of exciting possibilities and I hope to see some forward thinking interface changes in Cubase 7.