I’m saying it’s much harder than your original comment insinuates. That jet in your example has tens of thousands of parts and if you want to protect the entire supply chain, it can’t just be a few companies. Many of those suppliers are also not just supporting jet manufacturers. Eg, a company that makes teflon o-rings for the jet likely makes o-rings for dozens of non-aerospace products. Complex machines are not nice, vertically integrated manufacturing ventures in the modern economy.
Perhaps I’m confused and misreading your previous comments. It seems like on one hand you’re advocating narrow application, while also saying an entire supply chain would need to be protected to have the intended effect. In a modern economy, those two seem in conflict in any complex system. This means the execution is neither easy nor obvious. The only one I can think of where that may apply is nuclear weapons, which is so tightly controlled it’s more of a quasi-government manufacturing endeavor.
