The potential danger of going mainstream is that members may become more comfortable reading about the WTS from sources that aren't approved. I don't know when was the last time they explained their interpretation of Revelation and how it applies to them in 1919. If it hasn't been mentioned in a long enough time, they just memory-hole it.
After all, their books once explained how the measurments of Egyptian pyramids helped with their timelines for predicting events. They thought Jehovah's "home" was in the Pleiades. They stated that organ transplants amounted to cannibalism. They bought a house in preparation for the resurrection of Biblical personalities who would arrive soon and rule as princes. There have to be some JWs who have old magazines/letters from the 60s and 70s in their possession that refer to the "months remaining" before the end of the world. And so on.
They have never been shy about putting their ideas in writing for the rank-and-file, and then brazenly blaming that same rank-and-file for misreading or misremembering those printed words. But that requires a level of control and fear that have to be maintained. The more mainstream they become, the higher the risk of people holding them to their promises and predictions, and not backing down in the face of lies and misdirection.