Utilizing secular sources has become much riskier in the information age. The Watchtower has a long history of taking scholars out of context, and using old outdated sources to bolster their doctrinal claims. But today, this kind of shoddy research is not so easy to foist on people who are intellectually curious and Google-savvy.
We must remember also, that the general public (particularly Evangelical ministries) still read and critique Watchtower publications. Their evaluations are also available online. Because of the massive growth of Bible research websites, the Watchtower cannot so easily get away with taking scholars and commentaries out of context; especially when it comes to their key doctrines.
It is safer to just print simplistic material which makes sweeping generalizations and grandiose assertions; while appealing to the lofty authority of the "Slave Class". Hopefully, the rank and file are indoctrinated enough to just swallow their teachings without asking too many questions.
But, I believe besty really hit the nail on the head. Most of the growth is in third world countries where most of the people don’t even know their multiplication tables. The Watchtower has no choice but to radically dumb-down the material in order to appeal to these ones.
I think the Watchtower finds itself in a dilemma. They must publish sophomoric and simpletonian material to reach many of their new converts. But with this new trend, they will continually bore those in more educated countries who hunger for something a little more esoteric. Many of the more intellectually curious minded friend will begin to explore outside sources more and more; and discover facts that are quite different from what is in their Reasoning From the Scriptures books.
The Watchtower’s attempt to shield its teachings from scrutiny by bulwarking them with platitudes, slogans, and catch-phrases just isn’t going to cut it anymore; not in the information age.