And you’re seeing this nuance while simultaneously reading subtitles? From a speaker at a distance? GP is correct, sign is a fully expressive language, far richer than subtitles.
And nobody's at a distance, the cameras are always on either a medium or close-up shot when filming politicians speaking.
If subtitles were equal value or even “good enough”, they’d be used exclusively. That they aren’t should tell you something, and you repeatedly protesting that you are unable to comprehend the value doesn’t mean it isn’t there.