I can assure you from personal manufacturing experience, velocipedio, there is a huge difference in QA (quality assurance) between Taiwan and the USA. For many reasons, the quality produced in the USA is significantly better than that produced in Taiwan for virtually all products.

Products produced in Japan are also significantly better than products produced in Taiwan.

Products produced in Britain and Germany are significantly better than products produced in Taiwan.

The problem is that few consumers are willing to pay the cost premium for having products produced in the USA, Japan, Britain, or Germany.

Interestingly, many Japanese consumers ARE willing to pay a premium for better quality. In most of the world, Japanese name brands are actually produced in other less costly locations such as Malaysia, China, and Taiwan. However, in Japan you can still buy Japanese made products, but the price is higher than the imports. In the bicycle trade, for example, the consumer can chose between a Japanese made Bridgestone bicycle or a foreign made bicycle. The foreign made is considered to be of inferior quality and costs significantly less.

I suppose the same is true for USA Trek, for example. The low end models are produced in China while the high end products are produced in Wisconsin, USA.