"Change" is a harsh reality in this system. In the last decade, I've taken careful note that the political, economic and changes in the state of the national security in the United States (my place of residence) has caused a great deal of anxiety to average citizens.
Moreover, this I say, brothers, the time left is reduced. Henceforth let those who have wives be as though they had none, and also those who weep be as those who do not weep, and those who rejoice as those who do not rejoice, and those who buy as those not possessing, and those making use of the world as those not using it to the full; for the scene of this world is changing. Indeed, I want you to be free from anxiety. 1 Corinthians 7:29-32
The fundamental Bible foundation in Jehovah's Organization has remained solid throughout the duration of the organization's history. The Bible may constitute a perfect message from God, but the common error of thinking is that all Bible research and associated literary output must be called “perfect” in an absolute sense, without limitation or it has no merit.
My father graduated top of his math class in college. He studied the Bible sometime after this and assumed the Bible would be an open and shut book case, a book like any other college textbook he studied. As it turned out, the Bible was a much more difficult book to read than any other book he read, one requiring greater effort and concentration. He found that much it he could not understand in his initial inquiry. Would you expect any less from (a supreme being) God's Word? If there's an organization dedicated to this purpose, why should they be subjected to harsh and unreasonable criticism when new understanding is discovered?