MacGyver, the main point is that the patients have a physician that speak their LANGUAGE, not that they are from their exact group.
Cultural affiliations are of course nice to have, but obviously come second to the language considerations.
In highly Cosmpolitan areas, the resident roster tends to read like a demograph of the city in which they reside--they rather correlate--a very wise move anyway you slice it.
"We have three PTs here, none speak enough English to communicate well: one speaks Arabic, another Creole, and another Spanish." What will be done?
It is merely realism and utiliatarianism in action to bring on docs for whom this scenario is no problem--no problem at all.