I realize some Witnesses will say how wonderful it is that the Governing Body has put into print how their understanding has changed over the years.
The sheep and goats, the faithful and discreet slave, the evil slave class, etc. are all viewed differently then originally understood.
The sad thing is that IF YOU questioned ANY current understanding, as explained through the Watchtower, or if you disagreed with it, you would be disfellowshipped!
Even if their understanding was totally in error, if anyone ever pointed it out, they were OUT!