The Difference Between Untangling Hair for the Ghusl of Janabah and the Ghusl of Menstruation

Question:
He says: Honorable Shaykh, may Allah grant you success. He says: The author (may Allah have mercy on him) mentioned in the chapter on tending to hair that untangling it is not obligatory. Then, in the chapter that follows, he mentioned the recommendation of untangling hair for the ghusl of menstruation. What is the difference between the two, given that neither is obligatory? What is the wisdom behind this, may Allah grant you success?

Answer:
Some scholars say that she should not untangle her hair at all, neither for janabah nor for menstruation nor for post-natal bleeding; rather, she should sprinkle water over it three times. This is their view. The second view is that it is obligatory for her to untangle her hair in two purifications: the ghusl for menstruation and the ghusl for janabah. The third view, which is perhaps the most balanced, is that it is not obligatory for menstruation, but it is obligatory for janabah. It is only obligatory for menstruation, in the ghusl for menstruation. Yes.