I haven't found anything I did in a darkroom that can't be duplicated digitally
No doubt. There's little that can't be duplicated, relicated or mimic'd digitally. But just because a process in the darkroom has a digital analog, doesn't mean the digital version is the same. Thats' not to argue either one is better than the other. The main thing you cannot dodigitally is make traditional darkroom prints. If you made a darkroom print with the computer, it wouldn't be a darkroom print anymore, see? It sounds like a silly argument, but it's actually a very important one, I think. You might say that you can do everything with acrylic paint that you can do with oil paint, but you would be wrong, because you can't make oil paintings with acrylic paint, quite by definition.