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If I understand correctly, the difference is (or could be) that film has been "processed," and comes back to you as a "finished product," in that it has been transfered from negative to photo paper, where yet more "clumping" takes place.
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Film photos are made my exposing light to layers of emulsion on the photo paper. DIgital images work with pixels, and there is not as much value compression.
Yes, you can definitely tease out information both in lights and darks with digital images - which isn't the case with film.
Brenda, I am certainly in the slow learner's group with Photoshop compared to you! Having started out with painting from film-based photo images, I still continue to assume that the color will be wrong,the values will be incorrect and that the edges are completely false. I still make those assumptions even though I now use digital images. From my sense of time utility, I don't really try to get the color I owuld get from life, because I don't think I can. (Although Bill Whitaker regularly produces spectacular color in his subject photos)I just try the best I can to interpret what's in front of me.
Posterizing can be a helpful tool, but it's just not the answer.