Following through on this notion U.S. Citizenship and Immigration Services abandoned the long-permitted practice of allowing a company to petition for an H-1B for the founder of the company.
Given the long waits for green cards, an H-B visa is usually required if a U.S. employer wants to hire a skilled foreign national from a U.S. university or abroad.
In practical terms, an H-1B temporary visa is often the only way to hire a foreign national long-term to work in the United States, including international students off U.S. campuses.
Given that using an H-1B visa is often the only practical way to hire a foreign national to work long-term in the U.S. that would present a major problem for growth and innovation.