Thanks, if you want to see this in H19, feel free to send an RFE to SESI
Apart from the obvious space savings, particularly on smaller displays such as on laptops, it has just as much benefits on larger displays. Right now I am using it with a 32" Asus ProArt PA32UCX-P, and it's even better than my old dual 30" monitor setup.
One big advantage with a single display using this setup, regardless of display size is the ergonomics, where you don't want to constantly turn your head side to side to look at the viewport and then the network editor, and so on. You look at the same place for both the result and the network editor, which I call "zero head travel (tm)"
You can also switch the viewport to a render view so you can work seamlessly while interactively rendering. Of course the same thing can be applied to other viewers such as Composite viewer.
A lot of thought went into designing this system and I am constantly refining it on the go, when I have new ideas, and some time to implement them.