All the people arguing for RCV are hoping it will solve their problems. I’m skeptical.

There are loads of other voting systems in action out there. Some of them guarantee full proportional representation to their respective countries. Generally what we see in those countries is a ton of different small, special interest parties with a few seats apiece. Then you end up with these bizarre coalitions where a bunch of unrelated special interests band together to form a government which roughly half the population ends up hating anyway. Israel is a prime example of that.