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Even among the wise, those who truly understand the secrets of the Sacred Bones are indeed a rare few.
The secrets of the Sacred Bones are not what one would consider substantial knowledge.
For the saints never intended to "encrypt" this knowledge from the beginning. They announced the Curse Binding publicly to obtain a powerful oath-binding force.
The problem lies in the fact that the secrets of the Sacred Bones are not very "practical."
Even with this knowledge, one cannot conduct rituals or create influence. Although the curse imposed on the related saints becomes stronger as the knowledge becomes more widespread, and thus the power of the oath is enhanced... that benefit has nothing to do with the learner.
This is just "knowledge" after all.
The reason Naifertali had such a profound understanding of the Sacred Bones was not unrelated to her mentor, the Bone Healer named Seti.