Our ability to focus on different things is one of the strengths of our truly incredible brains. It's a skill we would definitely not want to lose. However, psychologists and neurobiologists have both shown that we pay a price when we multitask.
I argue that delegation is best because it allows the servicemen to do what they are good at so one can focus on what they themselves are good at. But are we really doing what we are good at, or are we just spending more time distracting ourselves with less-important tasks?