Interesting post. The change in wording of the baptismal questions you highlight is significant, but I don’t know it can bear the weight of an entire pivot from Protestant to Catholic ethos you outline. For example, the phrase “the Society” rose to prominence already under Rutherford, and functioned somewhat like a Catholic appeal to authority. This linguistic process is documented, and much lamented, in Timothy White’s book A People for his Name. A similarity in structure between the Watchtower organisation and the Catholic Church, especially following the restructuring in the early 1970s, was also already noted in graphic form by Penton and others in the 1980s.
From a certain perspective, especially for anyone familiar with the Christadelphian tradition, and to a certain extent Brethren and Presbyterian traditions, one of the remarkable aspects of Watchtower history, especially since the 1930s, has been the striking lack of divisions and splits that chronically plague those other groups. How do we account for that? Surely lots of factors are involved but the centralisation of authority and the “faithful and discreet slave” teaching are surely essential ingredients.
I very much agree with you (I think) that it would be great if JWs could move to a position of accepting differences of opinion and interpretation to a (far) greater extent than they currently do. Whether this sweet spot can be achieved that you hint at, whereby a Catholic approach to diversity may allow differences to flourish without the Protestant penchant for it resulting in divisions and splits, I do not know. I do know that when divisions on matters of doctrine and policy begin to take hold among a faith group it can become chronic, debilitating, and exhausting for all involved. That is something JWs have never had to contend with, indeed it’s so far outside the JW experience that complacency may make it appear in some sense impossible. But if you open the door to greater variability of belief and practice it might open a door to something that is both unfamiliar and not easy to contend with. I don’t say this makes it not worth doing, but if so it would preferably be with eyes wide open to the challenges and possible consequences.