Yes it does. A good way to getting "millionaire" salary in the world is to work remotely for US/UK companies. In the "new" remote age, it matters.

But working remotely from another country, it's much more likely that the engineer will work for a local company (or another international competitor) after that. Engineers that move to SV for a job are likely to work for US companies for a long time.

For the individual company the difference will be small, for the US as a whole it's a big difference.