China isn’t a utopia, it’s a successful anti-imperialist project going through many struggles and sometimes backtracking on what we would perceive as progress. It’s an entire, complex country with a culture very different from the one in which you were probably raised and with different priorities and customs. If you lived there, you’d probably want to be a reformist just like you likely are here, just no longer in the imperial core.

This is for the most part true. But I should note that China is improving in almost every area not just material conditions.

When you compare to the US it is true being middle class in the US is still better than living in China, but that is the situation currently. The US in decline and everyone should expect that to accelerate, while China is rising and improving and the worst thing it could happen is a slowdown in economic development due to the global economic situation.

Ultimately there is also climate change. China will definitely try to mitigate it sooner while the US will suffer major catastrophies untill anything gets done. And we know history, look at Katrina, look at Puerto Rico and Hurricane Maria.

Of course climate change will affect everyone including China, there is no guarantee China will be particularly competent in mitigating it, but if there is any assurance to be made is that it seems they'll almost certainly take it seriously and that matters to everyone younger than a boomer.