Well, "There Will Be a Scientific Theory of Deep Learning" looks like flag planting - an academic variant of "I told you so!", but one that is a citation magnet.

It's actually really fascinating that there isn't a scientific theory of deep learning, especially as it's a product of human engineering as opposed to e.g. biology or particle physics.

There are very good reasons why it took this long, but can be summed up as: everyone was looking in the wrong place. Deep learning breaks a hundred years of statistical intuition, and you don't move a ship that large quickly.

There is, but it is fractured. I would equate this effort as more of a standardization of terms and language.

Calling it “a product of human engineering” is misleading. Deep learning exploits principles we don’t fully understand. We didn’t engineer those principles. It’s not fundamentally any different than particle physics or biology, which are both similarly consequences of rules that we didn’t invent and can’t control.