The reality is that without immigration, this work will just shift to India, full stop. Visa sponsorship is a plum that benefits the outsourcer in their recruitment.
The current system very much benefits the US. Work visa holders pay taxes, support the local economy, and navigate a difficult journey to a green card and citizenship.
When you let populists rile up “the voters”, you get what’s happened in agriculture. Long standing seasonal migration get harder, and the farming moves to Mexico. We let the packinghouse unions get busted, and now there’s an environmental disaster in feed lots and rural facilities.