The ordinary Soul-Seizing Technique isn't this complex and rigorous, not only is it safer, but there are also ample choices.
However, the special Soul-Seizing he employed was quite random, and without the memories of his former life, he was no different from an ordinary person. As such, it was very possible that he would die, his Dao dissipated, before his memories awoke.
Awakening memories also depends much on luck; it might happen at the moment of adulthood, or perhaps never in a lifetime.
The benefit is that no one can tell that he is a person who has used the Soul-Seizing Technique!
For a Demon Cultivator like him, infiltrating the East Continent Immortal Tao, it is the best method.
Soon enough, the Demon Cultivators hidden within the East Continent were using this very technique.
