I think comparing the US to others is often a bad comparison. Most others have coalitions and you'll find that two coalitions dominate. In the US parties act as coalitions. We can see the wide range in opinions from people like Warren/Sanders/AOC compared to those like Pelosi/Biden/Harris. Even in the Republican side you have this massive division, though they've been more effective lately at achieving a party over principle strategy. So two coalitions isn't really any better than what's here in the US because it is in essence the same thing.