Careful thought... No, even without careful thought, one can understand. The Power of Return is not the force that transforms things into their "correct form," but rather the power that reverts things to their "original form."
In today's world, there is no such concept as "original correct form." From the moment Liu Shuying called it forth, this world was full of flaws. So, if the Power of Return could truly make it correct, it would certainly be in the form of the "previous world."
That would only fulfill Tai Sui's desire, but it would go against mine.
My attempt to use the Power of Return to restore human history was doomed from the start, just a test born of curiosity.