As I understood it during my active years the reasoning was following
1. There is an absolute truth, at this time it is not completelly revealed to us, we could not handle it.
2. The existing light is the only one people need to follow, not trying to promote new thoughts and quicken the path of new light, because
3. The person's true nature and Godly behavior is only measured in how accurate this person will obey the existing light as presented by the slave class
So in essence it would not matter if our understanding or what we believe today looks like this and would be understood in totally opposite way tomorrow, as the only thing that really matters is following the current understanding presented by slave class. People following or referring to old understanding or people speculating new understanding (that very well might become the new light later) have kind of fallen from the correct path as they are not exactly following what current light is about.
The conclusion of all this is that what was believed (understood) at one point of time do not really matter or should bother us, as the real truth will not be revealed until in the very last possible point of time, maybe even after the big A with the new scripts.
Whatever
CP