Why keyboards are inefficient

Information content of English ~1 bit per character. 
Each keypress on a QWERTY keyboard could convey ~6 bits. 

Keyboards are digital : hands are analog.  
A pointing finger can generate information at a rate of 14 bits per second (Drury and Hoffmann).

So... potential writing speed of just one finger is
14 characters per second?
(~170 words per minute)