What others have said about comparing actions with Photoshop is a good one. Are you giving this talk with a visual presentation? If so you may take a typical digital image and show how using curves, by applying a typical characteristic curve, at toe and shoulder improves the image. You could also show images by people like Jerry Uelsmann to show how, what some people think is unique to Photoshop can also be done in the darkroom. Also, show pictures taken by the greats on film, to impress that multiple shots available with digital has nothing to do with the photographic skill concerning the moment of capture and effective composition. You may also point out that technological and aesthetic improvement is not always in step with chronological progression.