I was an early adopter of Dtouch for Nuendo and found it ultimately wasn’t working for my workflow so I put away the touch screen altogether, using just the mouse. At the time I was trying to use the touch screen for everything.
I am now trying out Dtouch version 2 and love it. I am using it as a replacement for the Mackie controls and I have now removed my Mackie Controls (except for one extender to make use of Dfader mode). I think the trick is to use two screens. I have a main screen for the project window, vertical, and the touch screen for the mixer, horizontal, with Dtouch. This seems to be a great combination and the best of both worlds.