But I dislike it particularly because often it feels like a statement: we don't know what the causes are (which is why we make the weakest possible claim by using this incredibly expansive category), and we aren't going to try to find out.
So I particularly appreciate this program, and the research it is based upon. We have a pretty well identified phenomena: talking a lot to kids, at a young age, helps them. A lot. And some people talk to their kids a lot more than other people. We should delight in this finding! We have a pretty clear way to identify a lot of kids whose lives could be greatly improved through changes in their parents' behavior, and that change is widely accessible.
It's this kind of finding that penetrates "socio-economic factors" and in the process identifies something actionable.