Rob,
That is an excellent question. I hope my answer is as good. Here goes:
Silver gelatin emulsion is the very definition of "traditional" photography. It is as broad a topic in photography as you could ask for. It covers 135 years of photographic history. That history did not end with the digital camera. If people are going to actually learn to make emulsions and use them, the totality of photography as it exists today must be brought into the discussion. This is especially true for the easiest of emulsions to make (even if your darkroom is a temporary space in a tiny bathroom) -- paper. Gorgeous handmade prints can be made easily with digital negatives. So, as I see it, a Group that allows a holistic discussion is actually the "dedicated" forum. This one, which disallows a huge piece of the Whole, is where the diluted discussions reside. I'm very happy to see this one dedicated to esoteric discussions by people interested in the technical history and chemical minutia of photography, but who never intend to make emulsions. That, too, has its place, but few here seem to be making emulsions.