Have you read much other fiction translated from Chinese? That's a feature of the language and the culture. Or would you have wanted the translator to add extra dialogue to make it more English?

Probably compounded further in Three Body Problem because the writer doesn't really care much about (individual) humans. The whole book series is just an extended allegory. The characters are essentially placeholders for specific virtues or failings in humanity. Dunno, maybe this is too much of a hot take but that's how it appeared to me and based on some interviews I've read of the author.