Remember that with advanced MT, the application will configure the UI, not the other way around.
When you open Word, for example, you place your fingers on the MT pad in the most comfortable position and the alphanumeric keys arrange themselves in whatever weird curvy arrangement fits you best. The numeric keypad would no longer be rectangular - you just have a numeral under each of your digits.
You open GB, you get mixers, transports, and presumably a function key to move instantly among drag-and-drop customizable UIs. You open a boat-racing game, and there's a throttle, a steering UI of some kind, weaponry, whatever - it's no longer limited by the buttons on a device. Steve hates buttons so much that he will eliminate them from computing.
And computer graphics can introduce a whole new experience of finger-painting - instead of smeary strokes like you made in kindergarten, your fingers can trace vectors, hairlines, airbrush, wide, etc. The stylus and its variants - pencils, brushes - are so ancient they seem more natural to us than fingers, but they're not . . .