This is a very rosy picture, unfortunately to the point of delusion. There are huge questions about the labour used in various stages, and the production of some of the raw materials is environmentally questionable.

Sure, but most of it happens in countries beyond china.

In any case, I literally have a cousin who's lived ten years in China building a 3d printing company, and the last reason he went to China was cheaper labor, that was borderline irrelevant.