The Governing Body is unable to leave the mid 20th century. Either that or the Service Dept. keeps hiccuping. Either way the Witnesses are left to continually say the same old thing at the door: "I'm here because people are concerned about where this world is heading." (June 2015 U.S. Kingdom Ministry)
It goes on: "Do you think conditions will ever improve?"
What the householder is really thinking is: "Yeah, I hope things will improve and you stop bothering me with your religion."
There is a blindness in the Watchtower. They believe that to trample a territory to death is a good thing. They believe that to encourage more to pioneer in an area that is so overloaded with pioneers that everyone and their brother knows each householder and their views on religion is a good thing.
They believe that to force the publishers to work the same territory over and over and over several times in the same year is a good thing.
Who does this?
Robots. Robots in the Watchtower who are in fear of doing something intelligent lest it be struck down by the Governing Body!
Frank