Most of the world isn't US, EU, Canada, Australia, New Zeeland, Singapore, Korea, Japan. Life is very difficult outside those areas right now.

Most people who complain about vocally about life in the US tend to be financially stable expats from western Europe or equally developed nation, not India, China, Bangladesh, Pakistan, etc.

I had this conversation with Indian citizen a lot . My very limited experience is that the sex and the marital status will lead the decision. Also; not being able to be dual citizenship is harsh.

Well, "not able" is correct but it seems there's a workaround by being a person of Indian origin, no?

In terms of population centers yes? South America, Africa, Asia (at least 90% of it if you're generous).

Are India and China and Nigeria broken ? ( I don’t have the answer , but I believe those 3 alone are “most of the world” )

China is mostly fine now and they are building a lot of infrastructure. India is improving but still have a very long way. Nigeria, I don't think they are anywhere near to "emerging" anytime soon. That being said, despite having a high "GDP per capita", they have a much serious over-population and chaotic scene than India.

But maybe they can flip that with the help of China?

China is a dystopic totalitarian regime with an insane youth unemployment and a collapsing economy.

It's a really fun place to visit with vibrant city-life and very friendly people.

Just a about all my Chinese American colleagues love going to China for vacations and quite a few plan to retire there due to the lower cost of living.