From this point of view, I think the fundamental flaw of the USA is the majoritarian electoral system. Majoritarian representation tends to degenerate in the long run into a gridlocked two-party system, a prime example is the USA.
Thus most of the ideas behind the USA are great, but the electoral system is fatal.
The two party system is still, in effect, a coalition system; the difference is that voters know ahead of time which coalition they’re going to get.
> Meanwhile in Germany, it’s impossible for a voter to predict ahead of time what kind of government to expect from voting for any given party because almost any party could become coalition partners with just about any other party.
You have to trust that the party you're voting for will negotiate in a way that is acceptable to you. I'm not convinced that's worse than your situation in a two party system where you're guaranteed a coalition that's probably not exactly what you wanted.
In a parliamentary system you don’t even have an executive branch unless you can get a coalition. And when it comes to Supreme Courts, not only does nearly every parliamentary country also have one, they sometimes have more of them. Most European countries are subject to ECtHR on top of their national supreme courts.
> You have to trust that the party you're voting for will negotiate in a way that is acceptable to you. I'm not convinced that's worse than your situation in a two party system where you're guaranteed a coalition that's probably not exactly what you wanted.
But at least you know what you’re voting for.
I think a gridlocked majoritarian system is probably preferable to a proportional one that requires governments to get in bed with far right/left 'kingmakers' who hold the balance of power - e.g. Sweden, Netherlands, etc.
It doesn't seem like that's how it works, but it does. Even the sensationalist headlines morph and the talking heads add/change their propaganda over time.
It's got it's draw backs for sure, but the system is working as intended.
Other countries with majoritarian systems like the UK and Canada at least have 3 viable parties, even if there are two that are usually the biggest.
The trajectory of the USA might be instructive, in either a positive or cautionary sense: It began primarily as a group of governments, and then over time more popularly-democratic aspects crept in along with increasing federal power. (For example, disintermediating state legislatures from the selection of federal representatives.)