Good question. I think we know one reason: The clear anti-China bias in reporting.
The Washington Post story reminds us what such a blind spot misses in examining recent Chinese archaeological finds.
Chinese archaeology … is viewed as unrelated to American civilization. But that view should be rethought for multiple reasons: First, roughly 6 percent of Americans identify as ethnically Asian; that population is part of the American story, and therefore so is the history of civilization in Eastern Asia. Just as importantly, all ancient civilizations are part of human history and deserve to be studied and discussed on their own merits, not on their geographical or supposed cultural connection to the Greece-Rome-Europe lineage that long dominated the study of history in the West.