I think they understand this. This is demonstrated by there being little real understanding of ~300 neuron worm connectomes. The point of the article is discus

I think they understand this. This is demonstrated by there being little real understanding of ~300 neuron worm connectomes. The point of the article is discussing how mapping the full human connectome is only going to be a small next step towards understanding what's actually going on. That doesn't mean it's not worth doing.