There might be something deeper there. I am thinking of the line of research, associated with Bengio, about biologically-plausible backprop - it turns out that

There might be something deeper there. I am thinking of the line of research, associated with Bengio, about biologically-plausible backprop - it turns out that you can backprop random weights and backprop will still work! Which is important because it's not too plausible that the brain is calculating exact derivatives and communicating them around to each neuron individually to update them, but it can send back error more easily.