Just like a stock portfolio, the economy is healthier if it is diversified. That means we need to bring back manufacturing

We have a diversified economy, including manufacturing. We have plenty of high tech, high skill manufacturing that pays well. There is no benefit to trying to claw back low low skill, low tech factory jobs that pay even less than teachers. No one's portfolio is healthier because they move their investments from blue chips and Treasury bonds to penny stocks and meme coins. Blind, non strategic diversification for the sake of diversification is dumb.