We live in the age of the imperial presidency. Most Americans are happy with the president singularly deciding issues, so long as he decides the way they want it to be decided. I don’t think most people have a principled objection to executive rule. It is certainly the case that the president, as designed by the constitution, had very little power.
Congress has actually abdicated much of their power. This is especially true in making war. There is an incentive to do this. Politicians naturally want to avoid accountability. If they can persuade the voter, rightly or wrongly, that someone else is responsible they protect their position.
I think this is true. An advantage of monarchy is that the monarch is invested in his country. His wealth comes from it. Another is that he tends to look at the long term consequences of acts. He generally wants to preserve the health and wealth of the nation for his family. This can be contrasted with other systems where the political leaders are there only for a term. Such leaders have more of an incentive to make decisions to their short term personal advantage.
This election really showcases that. You have Trump who seems to want a better country, both now and in the future, for his family and family business. On the other side you have Clinton who makes money only off of political power and faces no downside to disastrous decisions for the nation as a whole. Trumps uniqueness as a politician comes from the fact he is a billionaire with a family business. It is his personal wealth, obtained outside the political system, that makes him the politician he is.