But even beyond exercising control at the local level, I smell a rat in the "don't document" advice: I suspect it's an intentional effort by the WTBTS to increase the distance between the activities and decisions of the individual congregations and the "Mother Ship", trying to cut down on the sheer bulk of 'smoking guns' that potentially serves as incriminating evidence showing the level of local control exerted by "Mother".
This is the key. Dont forget- Service Dept and Legal Dept work hand in hand. There's always a liability avoidance motive if you look carefully enough.