I had to google "differentiable programming" to see if they were really touting automatic differentiation as some futuristic language feature. Honestly the only real response to this should be :trollface:

I've been doing software development in data science, large scale optimization and machine learning for over 15 years... I've needed automatic differentiation in my language .... exactly never. I mean, most of the languages I use regularly are capable of it, and it is a neat trick; it's just not that useful.

The best part of this article is Yann and Soumith twittering they need Lush back (and not because of automatic differentiation). I agree; it's still my all time favorite programming language, and I don't even fool around with Deep Learning. https://twitter.com/jeremyphoward/status/1097799892167122944