Survivor Bias at play, the ones do go back, go back. I think the mentality among Chinese research community had changed rapidly, especially in Computer Science field, where China is as practical a choice as US.

The problem with US is for foreign nationals, there is a preset role for us to fit in, while in China, it offers more potentials. I won't say certain it is black and white question at this moment, there is trade-off in between. Living in US is no longer the non-brainer