I totally agree with you
I look around myself and noticed the same thing. In addition to 混的一般或不好, there are a small group of people who can't get a job that is comparable to what they had before coming out. When I mean "comparable", I am talking about position and income.
I had pointed this out several times, and were always ended up being attacked very emotionally, especially by the women.
If someone who is already making good living abroad plans to go back, then I think he or she has made the right choice. On the other hand, if he or she is just "so so" kind of people, I suggest a proper understanding of their "not so good" prospect back to China is totally essential.