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I always understood that usage to mean that there are deeper, unexpected layers, not that the time spent is necessarily valuable. “Discover the lost art and science of the London system” (in chess) would be a deep dive into it, rather than an explanation why playing it is a better use of your time than learning other openings.

of course that’s the meaning in this popular use of it. english isn’t a programming language with strictly defined terms like op wants it to be

Maybe, but it's an article about nature documentaries. Is 'art' not an appropriate term? It seems more applicable here than most places I've seen it. What term would you use?

I don't know, "what we can learn from...", "deep insights from...", "the lost benefits of..."?

You’d be surprised at the amount of things written by people to put a veil of logical reasoning behind impulsive, emotional and irrational life choices/decisions. Or maybe not.