The exact opposite is true. The only consistently working, stable democracies do not have a single leader of the executive branch, e.g. Switzerland.
The CIA sponsored extensive studies on this and came to the conclusion that democracies with a strong presidential role are associated with a greater risk of failure. It's not really surprising, and it can be seen in the US right now.
The US has not failed yet, only grown unpleasant for certain groups of people.
> The exact opposite is true. The only consistently working, stable democracies do not have a single leader of the executive branch, e.g. Switzerland.
That's correlation, not causation. Switzerland made enormous amounts of money from its banking secrecy system over many decades until the US pressured it to end it. And the trends are not looking good for Switzerland based on data. We'll see how stable it remains as the cost of living keeps rising, real wages decline, and unemployment goes up.
If you provide wealth and a good lifestyle to your citizens, then almost any system will be stable.
Yes and no. The US presidency is very different than the way it's reported on, but it is true that the executive branch is being more assertive to make up for the disfunction of the legislation. We're doing that intentionally and for good reason, to demonstrate to China that the US can act with speed as one small part of the overall deterrent against World War 3. The US is almost always hugely misunderstood, because there isn't any other country in the world that actually works exactly like the US does.
> The only consistently working, stable democracies do not have a single leader of the executive branch, e.g. Switzerland.
That system had to develop organically over many generations to be successful (in the case of Switzerland it was 500+ years with only a few significant interruptions) . In a centralized country with no traditions of communal and local politics it can just result in chaos.