Everything is wrong with the JW organisation, especially the reason for its existence! The whole corrupt religion is predicated on a fantasy that they have the truth and as if to prove it they are the only ones preaching it.
To change their methods would deny this belief. Preaching is the way they have got to where they are but alas for them it doesn't work effectively any longer. Nevertheless they keep on with the old methods and imagine that it is preaching which is the prime reason for their continued existence, forget the quality of the preachers.
I surmise they have had repentant sex offenders who have risen through the ranks who have proved to be useful to the organisation. This would give a precedent for the current situation and a possible explanation?