Although stripping away someone's essence would only happen in the future, and even if you stripped the wrong person, it would not cause permanently irreversible consequences.
You feared that if such situations happened too many times, your vigilance would slacken, much like the story of "The Boy Who Cried Wolf."
After this trigger had occurred too many times, when an evil complete Cosmic Lord disguised itself as a succubus, approached you, shattered your anti-scrying field, and tried to read your soul.
You might think, Oh dear, she's just playing♂games♂ with me, it's fine, and become slightly lax, too lazy to activate Future Prediction... then plunge headfirst straight to the bottom!
Yun Shou: "Yeah, how could any Haqi B keep overreacting forever?"
Primordial Dao Ancestor was very powerful, because his universe was already nearing its ultimate state. He had never rejected any external True Immortals, nor could he be bothered to pay attention to them. As long as they behaved themselves and did not stir up great chaos, that was enough.
Even if they really did create some great chaos, he would not need to act. Each of the thirty trillion Dao Domains had a Domain Master overseeing it, and Domain Masters above the 25 billion level would naturally resolve everything.
The reason you had drawn his attention was you, along with your guard squad.
"Wouldn't that mean every last one of them?!"
You were a mortal, yet not a purely ordinary mortal. "True," one of the three Dao Ancestors, watched over the cosmos and could sense that you had originally possessed the cultivation of thirty thousand Heavenly Layers through an Exotic Universe Dao Seal.
The rules differed from universe to universe. In some universes, one did not even need to become immortal; mortals themselves would live forever and never die.