This allows companies that truly want extraordinary talent to pay a premium to acquire it with no red tape . It also makes it far less likely that they can significantly underpay foreign workers to work in the united states and undercut American employees (at a 50% surcharge, you would have to pay 2/3 the prevailing salary to break even (assuming all employees are the same)).
The 50% number is something I made up, I think we can have an honest discussion about what that number should realistically be (and it should probably be different for different industries). But my main point is it should simply be a percentage tax paid on top of all compensation for foreign employees. This is the correct way to balance domestic companies undercutting domestic labor, while allowing them to access genuinely extraordinary talent with no impedance.