"...he held up a paper notebook. The device boots very quickly, has a nice "touch-based" pencil-oriented interface. No manuals or explanations are needed."
What!?! It took me a long time to read, and you could probably find witnesses who would affirm that I *still* can't write with a pencil! But, once I did learn to read and type, I could use a whole range of devices to do so. There will always be a learning cure for anything other than the most trivial of tasks. Our primary UI job is to minimize the additional learning beyond what most of use already have.