Excellent, ermghoti II! My research today led me to the similar information, which you've just confirmed, that one of the chief benefits of having higher sampling rates than 48kHz is to take advantage of these sympathetic interactions between instruments. Furthermore, this claim is not accepted by all audiophiles, so there is some dispute there.
Yet it's seeming to me that studios are leaning towards 96kHz or higher for their recordings, so that makes me wonder if there isn't something to what they're saying, because usually studios are frugal. Maybe it's just a question of wanting to impress their clients.