What is better than best, or ideal, is if Jah had had the Bible written in such a way that we don't have to guess what is truth. However, for whatever reason, He wants us to figure out what is truth. That means we are left to speculate, which inherently means we are going to be wrong quite often.
As you suggest, there would be no mistakes if everything was labeled "Not Sure". However, human nature is such that most will come to some conclusion, even despite your label. For an organization of humans to exist, the leaders have to make the best guess they can with the evidence they have at that time. It is incumbant that they also change as the evidence changes.