I think the corporate/globalist perspective looks at the liquidity of talent as well as cost. Having a native talent pipeline is possible, but it's expensive and takes a long time to create. On top of that, it's not very flexible if an industry suddenly shifts. Re-training is a much more difficult than simply hiring a different set of immigrants. It's important (at least to corporations) because it makes a significant difference for how quickly a company/industry can adapt and evolve to stay competitive in global markets.