To this reader, the point of the article seemed to be that while we understand some aspects of brain development, there is a lot of work ahead. They link to a

To this reader, the point of the article seemed to be that while we understand some aspects of brain development, there is a lot of work ahead. They link to a Neuron paper, which is closer to what I think you were expecting: http://dx.doi.org/10.1016/j.neuron.2016.10.059 http://dx.doi.org/10.1016/j.neuron.2016.10.059