From the “fire is hot” department, putting a veneer of touch support on top of the UI of desktop applications isn’t effective, according to Peter Bright:
Unfortunately, as soon as one ventures beyond mere reading, the experience becomes unsatisfactory. Finger users attempting to make edits will find themselves regularly dumped into interfaces simply not designed for imprecise input, and even if they stick to the “main” user interface (the ribbon and pop-up toolbars), that interface works poorly. The interactions with the on-screen keyboard are frustrating and the interface is cluttered, leaving too little of the working area actually visible.
It’s almost as if a keyboard and mouse interaction model should be treated differently than a touch-based model.