Very nice website with many solid principles! Though one big flaw in all the designs I've seen is that they rely on bad data - text corpus that is the output of human editing efforts, not the input.

So all those "0.00001%" stats aren't as precise as they seem, and you still see the frequently used backspace/enter in the awful pinky position despite the official philosophy of "Hands Down is easy on the pinkies"

Have you seen any design that is based on actual human input?