The context of this conversation is the root level comment noting a Bloomberg article where it's stated it would take them 8 years to move 10% of their manufacturing capacity to other countries from China.

Now, it still may be true that it's easier to manufacture iPhones than design them, but easier does not mean easy. Personally, I think you're just vastly underestimating how hard it is to manufacture iPhones at scale, which means not just finding the right part, but a part that can be delivered in the quantity and quality required to meet their production needs, and repeated for all the parts they need.