It really was the original form of limited government. Nowhere near as intrusive as our governments today. Back then, power was very diffused. Everyone had it from the King all the way down to the lowest serf. However, authority was concentrated (up at the top). The result was that if the king overstepped his bounds, he was just told: "No!" Try that today where authority is diffused (everybody has a vote) but power is concentrated at the top. If you don't vote the right way, they make you vote again. In the end, we all know that if voting was actually capable of changing anything, it would be made illegal.
Little thought experiment: Suppose our POTUS was replaced with a hereditary monarch with all the limitations on power originally enumerated in the Constitution. We suspect that the very moment he tried to make a grab for power that the law didn't give him, the peasants would be out with pitchforks ready to overthrow him. But, because we all vote we're all peachy keen with the Federal Government growing increasingly powerful.
If you can stand the persiflage, here's a playlist of Coulombe talking monarchy.
https://www.youtube.com/playlist?list=PLCVYi9yXYkhrhyWmfmdflvzknb7F3Dlls