After reaching the Creation Realm, it's difficult to refine a death replacement puppet because finding a suitable innate spirit root is nearly impossible.
Even if discovered, one might hesitate to turn the innate spirit root into a one-time consumable treasure.
However, several Creation Ancestors wouldn't feel much regret about this since they hail from the Primordial lineage. Their cultivation techniques differ from those of other races across the Ten Thousand Worlds. Even if unable to refine death replacement puppets, they have other means to employ, and even upon true death and dispelling of the Dao, resurrection isn't out of the question.
Moreover, at their level, dying isn't as simple as uttering the word. For instance, the Witch Ancestor lost vitality for at least a million years, but originally due to Qin Feng triggering the Heart of the World, the Witch Ancestor showed signs of revival.
