It's safe to say that many, perhaps most, of the changes in recent years, that is, after Freddie Franz stopped pontificating regular doctrine (even before his death), have come about for practical reasons, not due to any "searching the scriptures" to find out what they mean on their own. For example, the sharpening of "loose conduct" to morally shocking behavior was motivated by an attempt to find a reason for DFing those who would go to strip clubs, download porn, etc. Most of us who have been around the org a while have heard phrases from local elders like, "Don't worrry, We'll just get him/her on rebellion," meaning that rebellion will be the judical charge. They're just trying to get more specific, have more weapons in their arsenal to use against those not in line. Most of the changes in doctrine have the goal of something parctical. Likely others are due to protests from opposers. Jim Penton had for years been saying that the "faithful slave" was really just the GB. Then they change that doctrine to what Penton had said.
Just some thoughts, nothing heavy duty.