The point was it’s rare to care about global numbers, not that the US is the only meaningful subset.
As to why a US only subset may be reasonable vs a language specific subset, some US government agencies care about a global audience but many are US specific. They may have multiple languages because Americans aren’t all fluent in English.
As to why a US only subset may be reasonable vs a language specific subset, some US government agencies care about a global audience but many are US specific. They may have multiple languages because Americans aren’t all fluent in English.