Yeah, I get what you're saying, but it's not really an apples-to-apples comparison.
When we offshored manufacturing, we didn't build everything from scratch overseas. We moved into countries that already had or were rapidly developing industrial capacity, often with heavy government coordination, cheap labor, and minimal regulation. The global supply network was expanding at the time - tons of investment money, cheap shipping, new trade agreements, etc. It was a wave the U.S. was able to ride.
Trying to reverse that process isn't the same as doing it the first time, because now everything is optimized for the global system. The costs, logistics, and incentives are completely different. You're talking about unwinding a 40-year dependency on globalized efficiency, not just building factories, but rebuilding entire support ecosystems that were hollowed out.
But sure, it's possible. But not quickly, and not without enormous cost and disruption. We could do it if we had the political will and were okay eating 10+ years of inflation and scarcity. But pretending it's just a matter of "training people" oversimplifies how deep the structural rot really is and is a fundamental misunderstanding of how all these systems intertwine.