'Working hard' without 'working smart' doesn't get you anywhere. Why is no one talking about 'working smart'? It involves knowing how hard to work, when to stop

'Working hard' without 'working smart' doesn't get you anywhere. Why is no one talking about 'working smart'? It involves knowing how hard to work, when to stop working, when to step back and take measure of what's going on, when to go home and sleep... and every other thing that goes into making a successful company. 'Working hard', by Arrington's definition, doesn't cover any of these.