Yes, hence why I'd want an option for language agnostic results. It would be a terrible default.
There are cases when I'd even like REGION agnostic results, or least ones not bound by national boundaries. For example, I have an interest in my state history (MI), and there's plenty of relevant articles/commentary from the Canadians.
I also search in multiple languages but I also know that's an exception. The majority of the people in the world likely would only use a single language and it's easy to believe that search results are better for those users with languages separated.