Photography, as it exists now, is silver gelatin. The Pt/Pd and other methods are trivial compared to silver gelatin and it is vanishing. It is possible to mix and stir and get a good Cyanotype or Pt/Pd, but to get a good Ag/gelatin is a vanishing art. None of the above address this. You see, your answer falls far short of understanding silver gelatin itself.
I agree with artonpaper about this. I can understand the importance of silver gelatin, but many processes were used prior to it's existance and optimisation, to make very valid and beautiful images.