There are too many things for a central planning committee to stockpile them all, sure. But if incentives are correct then private actors will spring up and stockpile them for you. What we have today is a supply chain that's been fine-tuned in large part by (de-)regulation for efficient, brittle, globalized JIT inventory but it wasn't always that way. One line of thinking goes, if the lion's share of the gains from the current framework will just go to a couple of globomegacorps anyway, why don't we shake things up.