Yes, good ideas that have been around for a LONG TIME. Germany put theirs in place in the 1940s. Switzerland put their executive in operation in 1848. Denmark introduced PR in 1920.
So, these ideas are actually very old, that America doesn't seem to know they even exist is testament to how manipulated people are.
I've been harping on about PR on this forum for years, maybe 6 or 8 years, I don't remember.
The US problem is trying to get too many viewpoints into one political system. The Tea Party and Bernie are evidence of this, the same in the UK.
These parties should be separate so individual voters understand what a party stands for.
What does the Democratic Party stand for when there are Communists and Conservatives in the same party? And a current President who stands for.... nothing.
You can say that the EU is countries melting into each other, but I think the reality is that in the modern era, it's the only real way to survive. The EU isn't much bigger than the US. The EU, US whole of NATO and Japan, South Korea and others... aren't bigger than China, the threat coming.
However PR leads to more opposition to the EU, and is more likely to keep it in check than FPTP ever could. The EU is far, far, FAR more democratic than the US