To the sect leaders and elders of these immortal sects, since they are unwilling to relinquish their positions, they need to offer more benefits to newcomers, drawing them in to acknowledge their authority.
This is why they ultimately decided to join the Heavenly Court Expansion Plan. Even though they are aware of some drawbacks in this plan, it's undoubtedly a method to alleviate pressures.
Yet a thousand years have passed, the Heavenly Court Expansion Plan of the Divine Land World has reached a peak, even the expansion steps of those top immortal sects have begun to slow down, and the benefits gained have reached a limit.
Whether internally within the Heavenly Court or among various immortal sects, they have reached a limit, and the sharing of interests has reached an impasse, no qualitative changes have happened.