Canadian who has worked/lived in the US here. You're definitely right, there is no where else that is easier to make good money in the world. But there are issues. The cities where you demand the most (SF/NYC) can be pretty dangerous regardless of if you are a billionaire or not. A 14 year old girl was shot in the head outside of my wife's work in midtown Manhattan. In SF, there are streets filled with needles and human waste next to millionaires. Sure you make more, but the cost to have a child born is close to 100k in NYC and a reasonable school costs 50k/year. Don't get me wrong, I think America is a great country, I love the diversity of opinions, the ambition, etc. But it's not perfect and I don't think any country is.

I would also say, with remote work, geography doesn't mean much anymore. You can get a job with a company anywhere today because, frankly, the bar isn't very high anymore. MIT/Harvard/Stanford/etc. sometimes does produce smart, hardworking people. But more often then not I find the norm, even in NYC is entitled, dumb, lazy people. There is a sense of complacency because there are more jobs than people. This isn't everyone, I think Americans are still the most ambitious people in the western world, but I think it's the average today. But maybe that's the way it's supposed to be.

Lastly, I think the number that's probably most relevant isn't GDP per capita, it's GDP PPP per capita and under that lens, there are plenty of countries which are in the same ballpark.