Since the shattering of the Chaos World, countless eons have passed, a span even longer than the entire Ancient Era, yet after all this time, not a single one among the Great Divine Transcendents of the Mystic Sect has achieved the realm of the Daluo Jinxian of the Primordial. Why do you think that is?
It's still because of the influence of the grand environment of Heaven and Earth. The fall of the Chaos World from the Supreme World to the All Heavens and Myriads of Worlds has made cultivation much more difficult, with each realm's advancement threshold invisibly raised.
Just like in the Ancient Era, a Great Luo Golden Immortal was an Innate Dao Sovereign, but now, the realm of Great Luo Golden Immortal is toughly divided into three stages, and one must fully cultivate all three stages to realize the Dao Fruit of the Innate Dao Sovereign.