That shouldn't be the assumption. If there is slack to be picked up, good management should hire more labor rather than stretch existing labor thin and burn out their workers. Companies that grind people right to the deadline are doing it wrong.
I agree. At one company my team had a new manager start and one of the first things he said to us was "if you have to work overtime I'm not doing my job properly". That attitude should be more widespread in my opinion.
