Assuming it is true: Could be another move prompted by legal liability concerns. If a pioneer runs over someone with their car in field service, and that pioneer was appointed by the Society and thus doing the Society's work when the accident occurred, is the Society at least partly liable? Perhaps the Legal Dept. thinks the risk has become too great.
I'm stunned that this theory hasn't at least been tested, although maybe it has. There is a clear line between the WTS & the local pioneer due to that "appointment" and due to the mandatory hour requirement. I'm sure COs, DOs & Bethelites traveling on official WT business expose them to liability but that's much more manageable since there are not that many. I think there's also a pretty clear line on conduct by elders & ms since they too are directly appointed to that position by the WTS.
I seem to remember a case against a rank & file publisher a few years ago in FL (??) that was in an accident while in service which the WTS was brought into. They actually were dismissed from that case since they claimed the person was acting completely on their own in talking to their neighbors about the Bible. The plaintiff attorney must have done a very poor research job because with the offers for the month, talking points in the KM, officially sanctioned meetings for service with printed direction on how to conduct them and having most of the meetings conducted by officially appointed representatives of the WTS, I can't see how a judge could possibly buy that argument. However, the changes to the corporate structure a few years ago may be why. The Christian Congregation of JWs is the one appointing folks, not the WTS right? How many assets do you think the CCJW has? Probably minimial.
Sorry for rambling, but I could see this happening although I haven't hear anyone else mention it.