Ok I know this is nitpicking but...
I'm not sure I would want a 13.3" tablet on my lap or in my hands. There must be a reason the standard letter page size is 8½ × 11", right?
The diagonal on the standard letter is 13.9". The evidence Jeff cites completely undermines his point.
I'll just assume it must have been a really long time since he actually held a piece of paper.