American primaries and elections are noisy, but the government immediately has a majority. In systems with lots of parties, the noise and chaos starts after the election, when voters have no more influence over what happens. The resulting government can be the opposite of what the majority of voters intended, or have different people in it, than were on the ballot.

American voters determine the result, directly, down to the individual politicians in each seat. 

 💯 an underappreciated aspect of the two-party system 

Unfortunately, sometimes the two choices are a part of the same uniparty, but that's a different issue. 

 but the bureaucracy really runs everything, which is why things never change no matter who is in charge.  Nothing short of massively reducing the bureaucracy will make a difference and eliminating the mid- to high-level managers. 

 Yeah, wonder if they can do it. 

 I'd love to see it, but it will be an epic battle to get it done.