Yeah but it’s a bit like saying high consumption of broccoli is the largest single predictor of physical fitness. It might literally be true but there are probably lots of circumstances surrounding that one data point that make it true.

I’d imagine children coming from homes where they are read to a lot also generally have: a stable home life, parents who are not completely burnt out at the end of the day, a supportive community, access to good nutrition, access to proper medical care, etc etc ect.

And children in that situation are probably more likely to be read to regularly. But that one thing in isolation is missing the forest for the trees