One way of looking at it: it means there's a DAG of causation and you don't have access to the entire root set. (I'm not advocating for that idea being true, b

One way of looking at it: it means there's a DAG of causation and you don't have access to the entire root set. (I'm not advocating for that idea being true, but I don't think it can be dismissed on the grounds of not having a clear meaning.)