Has Apple CEO Tim Cook made Apple too dependent on China?

The Dow Jones Industrial Average is slumping Thursday afternoon with shares of Dow Inc. and Apple seeing the biggest losses for the index. This has led some observers to ask if Apple CEO Tim Cook has made Apple too dependent on China.
Cook, since joining Apple more than 20 years ago, is famous for having “transformed Apple’s supply chain, relying on China to manufacture devices with the help of low-cost, skilled labor, and to ship those products around the world,” as Mark Gurma