As someone who works as an engineer in high-tech who have a lot of context around this issue, I disagree with you wholeheartedly.

H1-B is America's secret weapon. Countries around the world would rejoice the moment we stop the H1-B visas.

We import the cream of the crop of people and they are what driving the high-tech scene in the U.S.

For example, everyone in India who gets accepted into the IIT universities attend for free on the Indian's government dime, but we import the best of the best of IIT to U.S. graduate schools and companies. They are literally driving the tech behind cloud, AI, high-tech manufacturing etc...

We are taking India's best people and have the Indian government subsidize our economy.

H1-B is not meant to import cheap foreign labor. You have other categories like TN visas for that.

To qualify for an H1-B slot, the sponsoring company must prove that they cannot find a U.S. worker to fill that position. The salary for the position must also meet the minimum salary, e.g. 100K-150K for an engineer position.

Joe Bob the cashier at Walmart is not going to lose his job because of H1-B.

The biggest issue with H1-B is the company who falsify applications and salaries of the applicants, but USCIS has cracked down on this a lot in recent years.

Big companies like Google, Amazon, Microsoft, Apple need engineers and researchers that can help them expand into high-tech areas. This in turn multiplies the number of jobs for Americans, like people who work at Apple's retail stores, distribution centers for Amazon etc...

Without the H1-B, the U.S. economy would be nowhere near what it is at right now.