You are absolutely right of course on how proper and final diagnoses is established. The problem is, and your wife will probably agree, is that the initial diagnoses, you may even call it suspicion, is the most important because it determines whether follow-up tests will be conducted at all. My point is, actually two points are that 1) fewer first patient facing physicians (the front line if you will) will be taught and gain the experience to recognise melanomas (or the likelihood of it being one) in the first place and 2) automated testing will be more expensive in some health systems leading to diminished access to proper diagnoses and eventually treatment for many, thus exacerbating the original problem.
Technology is far more useful when it complements expertise and experience not when it merely replaces it.