Clemens Vasters on twitter:
"When I'm writing specifications or deeply technical docs/emails I get into a deep focus state much like I do when writing code and that may last for a few hours when not interrupted. Coming out of that state, I will always be far more exhausted with specs/docs than with code."
MHO this is why not so many people in IT will go deeper into, what they are doing day by day. Or saying it with Steve Jobs "Think different".