It seems to me that a certain amount of growth comes from further specialization. At one end of the scale, you have a few people in the clan or tribe specialize in turning rocks into spear points, and others specialize in hunting, and the whole group eats better. At the other end of the scale, you have a globally-integrated supply chain.

At the other end of the scale. That is, there's no further to go. All the benefits that can be reaped from this process, we've already reaped. There is no further growth to gain from this approach.

(Or not much. It is possible for the supply chain to further globalize and specialize, but not orders of magnitude more. And, as we regard China as an enemy, and look at what happened with Covid, we may even pull back from the amount that we already have.)