That would be fine, but it never happens. The politicians, on both sides, always stick their oar in, one way or another. That's the god thing about Roosevelt, he set very broad objectives, and let the Joint Chiefs handle the details, even of the strategy.
FDR on few occasions over ruled his military people and made his own tactical choices.
Operation Torch was one of them. It was a political consideration that lead him to order the operation. It wound up being the right decision.
Sometimes the political hand played is a better military choice than not.
After reading about FDR and Lincoln in their wars, sometimes I fear Bush is deferring too much to his generals in Iraq and not pushing them hard enough.