Many, if not most, chips (by part number) are fabricated in one fab on the planet. It’s not possible to design a product with dual sources for every chip. This

Many, if not most, chips (by part number) are fabricated in one fab on the planet. It’s not possible to design a product with dual sources for every chip. This is particularly the case with older designs that are on the sustaining end of their life cycle. In some cases, a part # is run once a year, in one fab on the planet.