Having no CSD at all is unacceptable on small screens IMHO, far too much real estate is taken up by a title bar, you can be competitive with SSD by making them really thin, but then they are harder to click on and impossible with touch input. At the moment I have firefox setup with CSD and vertical tabs, only 7% of my vertical real estate is taken up by bars (inc. Gnome), which is pretty good for something that supports this many niceties.