>And historical record of the lack of QA coming from Chinese manufacturing

My endlessly excellent Chinese gear (Dahua cameras, XikeStor switches, etc) doesn't know what you're referring to.

Because we buy that stuff even without it. And if you make both good and crappy products, why sell the good stuff internationally?

The US did it when it was a bigger steel supplier, good steel was sold domestically, crappy steel was sold elsewhere. If you got crappy steel in Africa at the time you might have thought US steel was garbage with poor QA, but in reality US steel was great and they just shipped the crappy stuff because people still kept buying it.

China is a gigantic country where one in 6 humans live that either produce directly or indirectly, 70%+ of the world's goods.

It's quite difficult to make general statements at such a gargantuan scale encompassing every single sector.

China has an abundance of terrific QA in electronics and advanced technologies as much as it has an abundance of the opposite, just simply due to its sheer size.