Reliability of Big Data Predictions

In Knowledge Core:  Intriguing piece.  Philosophically oriented. A question we have asked of all analytics for many decades.  With the usual cautions and prescriptions.  But I ask:  Has this changed because you have more or more volatile data?  We always sought more data, and often did not have it.  Now we have it, and what does that mean?  Better predictions?  Or more difficult ones to explain?