The meaning of Self-Embodiment of Perfection was actually exactly what its name suggested. It was a technique that overlaid the destructive urge and instinct to harm others buried within a curse's nature onto Idle Transfiguration. This was not simply a matter of cursed energy control, but of combining a curse's psyche with Idle Transfiguration.
It was a technique of the "heart," much like Black Flash.
Beyond the surface-level explanation of Black Flash as a dual resonance between cursed energy and physical force, it was also deeply tied to the sorcerer's state of mind. Aside from Yuji Itadori, who seemed favored by Black Flash, even Satoru Gojo and Ryomen Sukuna were no exception. They too needed to maintain heightened emotions to use it.
The Mahito of the original work must have completely extracted that cursed instinct from within himself. It was like how Satoru Gojo temporarily stored positive energy in his heart, stomach, and spine. The original Mahito had also stored cursed instinct throughout the pathways of his limbs and body before unleashing it.
That was the truth behind Idle Transfiguration: Self-Embodiment of Perfection!
The original Mahito could do it, but the current Mahito could never do so. From the moment he was born in the sewers, he had resolved to strip away his cursed instincts. After growing this far, those instincts barely affected him anymore.
Forget him—even Jogo, Hanami, and Dagon, under Mahito's influence and Idle Transfiguration's adjustments, would no longer develop an instinct to harm people. Of course, the urge to kill born from anger and resentment was another matter. That was purely a problem with Jogo's own personality, not a cursed instinct.
Without cursed instincts, it was naturally impossible to use Self-Embodiment of Perfection. But wasn't there another living example right before Mahito's eyes?
Positive and negative energy