The Primordial True Spirit that could refine an Innate Treasure would only be capable of refining a top-tier Innate Spiritual Treasure if merged with the flesh of the Nine-horned Desolate Dragon.
Leaving the Primordial True Spirit alone in the Heavenly Divine Palace to nurture, though time-consuming, could potentially yield an Innate Treasure.
An Innate Treasure, indeed, is a divine item capable of suppressing fate. Compared to top-tier Innate Spiritual Treasures, the Human Race clearly lacks Innate Treasures. One is not enough, multiple are required.
Thus, for the sake of obtaining an Innate Treasure, Jiang Chen was willing to wait.
"If the Heavenly Divine Palace is promoted, this Primordial True Spirit will surely transform. At that time, it will become the embryo of an Innate Treasure, only requiring a large amount of original source to nurture, which would accelerate its birth."