[IIAOPSW]

I have and while its true a neuron does more than the simple on/off of their artificial peers, I'd hardly call it "the complexity of a large neural network internally". There just aren't that many bits needed to represent all the parameters you just mentioned. Stuff you mention like ion channels and neurotransmitters feels like excessively mimicking biological constraints rather than something actually relevant. Who cares if the real neurons use chemical channels and electrical channels to communicate, the artificial ones can just send the same information in electrical channels for everything.