Ahh. A resident Chinese manufacturing expert. Welcome.
My experience, as a manufacturer, is that Chinese quality can far exceed that I've seen in the west. Admittedly I have no idea what I am talking about, but what I have seen - obviously only there a couple of months ago so may have changed - it that Western business is only interested in the cost not the quality.
From my conversations with both Chinese & Western manufacturers, the Chinese are more than happy & capable of producing 100% perfect goods but of course they need to charge a reasonable price. Western organisations unfortunately do not value their customers so they buy cheap and get the quality the Chinese (or anyone else for that matter) can produce for the money they are paid.
Thank you for your valuable insight.