They said not everyone is that intelligent these days so WT knows best how to reach them.
It seems like modern converts aren't... "high-caliber" for lack of a better word. Every single one I've personally seen has been very uneducated, not all there, or emotionally needy (or all three). The average person googles the JWs and then runs in the opposite direction. Accurate info on JWs has been slipping down in the google search listings. I hope that can be corrected.