Curing is not about saponification. It might still be happening after the soap is cut and left to cure, but not always. That is what HP also needs a cure.
Curing is for the structure to settle and the moisture to drop. But a good example is a Castile - saponification and water evaporation is finished after a couple of months, but the difference between a 2 month old and a 12 month old Castile is striking
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