I genuinely don't mean this in a dickish way -- isn't this, like, tautologically untrue?
By definition, more nuanced, more descriptive language describes a narrower, more precise view of reality than broader language otherwise would.
When would plainer language allow less room for interpretation?
I do generally think writing laws and other documents in plainer language would be beneficial for society, but not for this reason. Sometimes you do have to describe a really, really precise concept. "Kill" is different than "murder" is different than "manslaughter" in ways that are meaningful and important to preserve.
Although even as I write that, I guess you could say "kill", "kill a person with intention", "kill a person without intention". That's kind of what you mean by word subroutines?
At a certain point this just seems like a similarly-complex vocabulary, just with more words, though.