In the grand scheme of things, your personal experience doesn't matter. The data tells us that most Chinese students in the US return to China. Some members of this forum already know that I attended a top 3 university (US News) for my undergraduate studies and I am currently at a top 10 university for my graduate studies. The best Chinese graduate students I met at these universities went back to China to become professors or researchers. Some of them stayed in the US to work for companies like Meta and Google, but most of the ones I met went back to China. I wouldn't extrapolate my personal experience to the rest of the Chinese students in the US, as I've only met a small percentage of them.
I agree that most recent breakthroughs in the field of computer science are not from China, but ResNet was literally invented in China. Are you really a researcher in this field? This is one of the most well-known papers in the field:
In other fields, especially the physical sciences, many breakthroughs do come from China. China's dominance in batteries and photovoltaics wasn't an accident. Feel free to take a look at journals such as ACS Nano, Advanced Functional Materials, Nano Letters, Applied Physics Letters, etc.
I agree that personal experiences can't be determinative, however they are still an anecdotal evidence that can be one data point to ponder. If your personal experience contradicts data, it is a way to explore why that happens. Your personal experience can be wrong. Maybe you had a confirmation or sampling bias. However, sometimes the data can also be misleading, collected wrong, have a misleading methodology etc.
I am not questioning that most (or many) Chinese students return.
I am questioning however the fact that the best and brightest return, expounded in greater depth in a later message.
Regarding Resnet Paper again, expounded in greater depth later.