That’s true, but as a Taiwanese I can tell you Taiwan being taken over by another country is definitely in the shortlist of plausible scenarios. Not particularly likely, but definitely not fictional at all, maybe somewhere around Pearl Harbor possibility.
Yes, there is a global supply chain fragility when it comes to a few companies controlling the supply of microchips. Nobody is suggesting that Apple somehow can do everything from scratch. Even if they had factories making the chips themselves, what if their raw material suppliers collapsed? What if a critical delivery route gets compromised, as happened with Ever Given? What if a war breaks out? What if, what if, what if... You can entertain any number of ideas. Everyone knows that the global supply chains have dependencies, and if something bad happens in the world, the economy and supply chains of the world suffer. This has nothing to do with Apple specifically.