The reason just-in-time is to blame, is that JIT assumes you have a reasonably stable flow (yes, I worked in manufacturing where we studied JIT a lot). Yes, it was a shift from services to goods that provided the current shock, but it was JIT that meant the system could not adapt to shocks. If you have no buffers (or very small ones), then you cannot quickly adapt.
If you put a vase on top of your car and drive away, it's irrelevant which bump in the road causes the vase to fall off; it was bound to fall off eventually. The global supply chain was optimized for efficiency, to the point of fragility, and whether it was a pandemic or a war or something else, a shock was coming eventually. With climate change, we can expect more frequent weather-induced changes in the future. A supply chain which cannot handle frequent, large changes is too fragile, and that's what's wrong with JIT.
If you put a vase on top of your car and drive away, it's irrelevant which bump in the road causes the vase to fall off; it was bound to fall off eventually. The global supply chain was optimized for efficiency, to the point of fragility, and whether it was a pandemic or a war or something else, a shock was coming eventually. With climate change, we can expect more frequent weather-induced changes in the future. A supply chain which cannot handle frequent, large changes is too fragile, and that's what's wrong with JIT.