The best thing about manufacturing in China is that they will make exactly what you specify. The worst thing about manufacturing in China is that they will make exactly what you specify.

no, they will often shortcut when they can get away with it. Companies like Apple just don't let them get away with it

The things on Temu are not the only thing China makes.

Are iPhones known for quality issues stemming from low quality parts?

And America isn't the only source of the world's aerospace or space-qualified screws, so what was the point of your comment? China is fully capable of producing high quality screws.