The creation of the cabinet system during George Washington's presidency was an important precedent because it established a structured way for the president to receive advice and support from knowledgeable individuals in specific areas of governance. This aligns with answer choice:
D. Presidents often lack expertise in certain areas of governance and can rely on the knowledge of others when making important decisions.
Washington's establishment of a cabinet allowed for the inclusion of experts to assist in decision-making processes, thus enhancing the effectiveness and informed nature of his administration.