The idea of progressive revelation is no excuse for "ERROR".What Witnesses never face is the enormous corpus of material from Russell and Rutherford that has never been even close to the truth.
Too,these leaders and their current successors advance their teachings in the most dogmatic manner,ready to exercise discipline on those who disagree,and unwilling to recognize that their "truth"might be overturned.
The idea of progressive revelation is no excuse for "EXTREME DOCTRINAL AMBIVALENCE."The extent to which the 'faithful and discreet slave',the Governing Body,has changed positions on what is really true and beneficial is simply astonishing.The list of doctrinal changes and doctrines no longer taught or believed by the 'slave'would fill volumes.
YOU,could no doubt list a number of the teachings and doctrines that are no longer taught or believed since you first became one of jw's.
From James Beverly's Crises of Allegiance.
Blueblades