I remember back in the 1970s that some JWs did not have a full understanding of all doctrines (Particularly the rationale for the 1914 doctrine). However, they had a simple grasp of the basic doctrines like soul and hell and some would be able to do some basic proof texting, though for the most part they had to rely on a publication to provide them a biblical verse.
I hear it's worse now but I figure that almost everything about the Watchtower has gotten worse.
It's possible that the Watchtower, realizing this, might have come up with the idea of having their teachings easily available in Internet form in order to bypass the ignorance of their members.