For my experience working with Chinese and other peoples' reports of the same?
I have worked for a company that has outsourced production to a Chinese company. They would try new trick every other month. Replacing parts for cheaper substitutes, skipping process steps, using counterfeit components. You point it out, they fix it, then they do the same when you are not looking at their hands.
Every time they are being polite about it, but you know, this happening almost every shipment is not an accident.
And even when you come with a solid proof they bend backwards to not admit they did it.
Read up on some other horror stories of outsourcing production to China.
Successfully outsourcing to China usually requires a sizable fleet of lawyers, constant presence at the production facility and inspecting every shipment for adherence to the contract.
Again, don't you understand the reason for why you buy Chinese from Chinese company and it immediately falls apart? Or tries to kill you? The Chinese companies that try to make quality products are a small minority. They do exist, my Andonstar soldering microscope and Rigol osciloscope is a proof of it, but they are an exception.