The point is that it's not commonly internalized to the point where someone will correctly use DAG as a synonym for "universe".

Synonym? Not just 'capable of being used to perfectly represent', but an actual literal synonym? That's a remarkable claim. I'm not saying I outright don't believe it but it is something I would want to see explained in detail first.

Would reading Pearl (competently) be sufficient to make someone use the term DAG correctly in that sense?