Re: I call bullshit
>Engineering is parameter driven. All important thicknesses, angles, lengths are set by entering numbers on a keyboard
Actually, CAD workflow is usually to 'sketch' the design intent, and then 'constrain' the entities to each other and add dimensions. You might enter these dimensions with a keyboard, or they may be derived from the results of a simulation, a parts catalogue or a spreadsheet, or be defined with respect to another entity.
With constraints, mouse-using designers don't rely on pixel-perfect accuracy - they use 'snaps', which can work in 3D just as with a mouse. Relations between entities can be revisited and edited at any time.
Even if you want to type in your dimensions, the Leap is capable of recognising when your fingers are above a number pad. It could even allow you to use your desk as a virtual keyboard if you wanted. However, voice input would work better for a lone Tony Stark in his own workshop than it would for an engineer sharing an ofice with others!