because hand coding keeps your skills sharp?
if i stopped hand coding and started using DW for a few months, i probably wouldn't improve as fast as i would if i hand code.
if you built a car with your own hands, wouldn't you know exactly how it works? if you purchased a machine that automates the process for you and does everything for you, you wouldn't know your car as well.
maybe i just don't trust programs and machines
but i also don't want to become dependant on something, like DW for example.