The area is under-explored because AFAIK there is no introduction for someone adept in machine learning to learn the basics with coding projects in for example

The area is under-explored because AFAIK there is no introduction for someone adept in machine learning to learn the basics with coding projects in for example pytorch and showing how causal inference is bringing added benefit. If you want to advance causality research, lower the barrier to entry just like it has been done with deep learning.