Of the top of my head: pollution, jobs that negatively affect your countryman and then require expensive healthcare, side effects (noise, truck traffic) that negatively affect knowledge workers, low pay.
I can't also think of any reason why bringing these jobs is a net positive. Like I get it, China is adversarial but there are 2-3 billion more people you can outsource this work to who are unlikely to get adversarial.
I can't also think of any reason why bringing these jobs is a net positive. Like I get it, China is adversarial but there are 2-3 billion more people you can outsource this work to who are unlikely to get adversarial.