That having been said, I have another thought:
This is a religion that seems almost addicted to making unnecessary alterations. Consider the fact that many religions are content to use the same hymns for hundreds of years, whereas Watchtower feels the urge to create a substantially new song book every 20 years or so. Or all the other pointless terminological changes over the years: swapping assemblies and conventions back and forward, circuit servant and circuit overseer, region/convention, sanctified/vindicated, presiding overseer/coordinator, and so on.
Consider the name of the Watchtower magazine itself. It’s had about five different titles in 140 years, whereas The Christadelphian magazine has had the same name since 1869.
Could it simply be that some brother piped up during a GB meeting and said, “we’ve not changed the baptism questions for nearly 40 years”. Someone was assigned to “improve” the questions, and this is what he came up with? Making direct reference to Jehovah might be construed as in some sense more revenrtial, like how they boast about the song book using Jehovah’s name more often than Jesus.
Could it just be change for change’s sake, and nothing more? Sometimes attempting to derive meaning from Watchtower actions is Kremlinology at its finest.