What Steve Blank writes here is the outer dialog and what seems to be missing is the inner dialog - listen to what your reports say! When an engineer says to you, at the end of the day, "this component just doesn't make any sense and I don't know what to do to make it work" don't just slap them on the back on the way out the door and say "I'm sure you'll figure it out, just try a little harder," maybe you as a manager should engage a little more then in the moment.