"But even when the USA sees the light on proportional representation"
"Sees the light"? Proportional representation is far from a panacea. It tends to lead to a fragmented government (which is usually bad). It also privileges party over individual candidates (which can be good or bad, but those who dislike partisanship would certainly disapprove). There are other factors at play as well.
Most (in)famously, the Weimar Republic used PR. That didn't end well.
"Sees the light"? Proportional representation is far from a panacea. It tends to lead to a fragmented government (which is usually bad). It also privileges party over individual candidates (which can be good or bad, but those who dislike partisanship would certainly disapprove). There are other factors at play as well.
Most (in)famously, the Weimar Republic used PR. That didn't end well.