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The Imperial Heaven Realm was able to dominate the Immortal Realm for so long naturally because they had their own trump cards. However, a trump card only serves as a deterrent. Once it's used the first time, it can work, but by the second time, it can no longer be called a trump card.
Moreover, in the past in the Immortal Realm, the twelve domains often experienced battles and strife. In such conflicts, the Imperial Heaven Realm always held a supremely aloof status, almost untouchable, and sometimes even had to mediate some disputes.
The Imperial Heaven Realm held such status not only because of their strength but also because of their lineage. The four words, "Descendants of the Emperor of Mankind," say it all.
