The reality is that the Vietnamese made Wiha bits did quite well in the Project Farm test; they were one of the best bits across all of the tests, but they were also ~2-3X more expensive than the other brands, and they didn't test 2-3X better. Since bits are highly consumable, cost vs performance means a lot. These are very high-quality bits based on his test results.
There is a strong COO bias with a lot of people here and they automatically associate quality with COO. And I get it. But you could have two identical packages of bits, mark one Germany, and the other Vietnam, and the Vietnamese ones would automatically be junk to some here. The bottom line is that manufacturing labor is very expensive in counties like Germany, and there's no reason an identical product can't be produced in Taiwan or Vietnam at a fraction of the cost. When Milwaukee moved some of their power tool production to Vietnam, I must've missed the revolt here. If the Vietnamese can make power tools, they can make driver bits with the right machines and steel.
50 years ago, "made in Japan" was a joke. 30 years ago, "made in Taiwan" was a joke. Now both countries are highly respected as manufacturers of goods. But the problem is that over time the manufacturing labor becomes too expensive- this has happened to China. Yes, it's still a fraction of what it costs in the US, but if you can make the same product in Vietnam for 20% of the cost, then it's just inevitable that is going to happen.