The reason why our Founders worked on the Executive position last, during the Constitutional convention, was to prepare the framework for the necessary ties required to keep the president from becoming a dictator. And while they were devising that position they had George Washington sitting there as their best example of what a president should be. It was designed as not only the executive, but also one who would be imbued with moral authority as George Washington has exhibited during his lifetime.
Power in the hands of a true statesman will help the people to maintain their freedom. Power in the hands of one who is not truly wise will cause the people to groan.
As Franklin walked outside the door of the hall, a woman asked what they had accomplished. Franklin replied that they had given the country, "a Republic, if you can keep it."