That is the ideal that we wanted back when we said Generals shouldn't send orders to the army. In most realms I have been a part of General dictate every aspect of the war. There may or may not be a council that discuss matters but the General sends out all orders for movement, refit and the like. The marshals only job is formations, pretending you are in a realm that uses them. Otherwise the General orders also include all required line settings.
People are free to speak up and/or protest. If everyone remains silent about it then nothing will be done.