Interesting video displaying some manufacturing quality control in the e-bike industry in China. The stereotype is that China doesn't care about quality. No, it's really the US corporation that outsources who doesn't care about quality. I've heard it said you can get quality from China if you pay for it. That tells you how much US corporations are the ones that don't care about quality.
In China they can now tell which worker on the assembly line doesn't screw in a bolt correctly so he or she can be given more training if necessary because every part is tracked on each bike and they know who assembled it. I bet that kind of scrutiny would never be allowed by American unions hence why you have missing or untightened bolts on Boeing airliners.