That makes no sense. Any US refinery that can process heavy sour can also process any other kind of crude. It isn’t the 1950s.

The US has very advanced refinery tech that can adaptively refine everything from heavy sour to light sweet. The reconfiguration for the customer is highly customizable and largely automated. It is why so many countries send their crude to the US for refining. The US refiners make money no what kind of crude you send them.