Only the truly old, and truly brain-dead and possibly ignorant, sheltered, homeschooled offspring remain.
My parents are still involved, and no, I wouldn’t describe them using the terms you mentioned. In fact, I still know many Jehovah’s Witnesses whom I would not characterize that way.
It’s easy to underestimate the influence a high-control group or cult can exert over intelligent, educated individuals. Among their members are accountants, lawyers, teachers, successful business owners, doctors, and more. These are people who genuinely believe in the core teachings and often find ways to suppress or rationalize the cognitive dissonance they inevitably face.
By reducing people in groups like the JWs to simply being ignorant or “brain-dead,” you risk overlooking the sophisticated and manipulative mechanisms that such movements use to maintain control — even over highly capable individuals.