I think it's interesting that he mentions that monitor + keyboard is better than a tablet because it separates out the input from the output areas and the "hand

I think it's interesting that he mentions that monitor + keyboard is better than a tablet because it separates out the input from the output areas and the "hands don't get in the way". But if you take the total surface of the keyboard plus your desktop monitors, it's way bigger than the area of the tablet. Make a giant tablet that's 32"x32" or some such, and I think it could be superior to monitor + keyboard for some things. The tablet lets you mix what areas are input and what are output for various applications, and that's way more flexible than being locked into fixed proportions.