If changing species could let them rise an entire tier directly, ninety-nine percent of Professionals would probably agree without hesitation.
It wasn't that they felt no attachment to being purely human. It was simply that the further one went down the path of a Professional, the higher one climbed, the more one realized they were no longer human.
"Spirit Sight constantly reminds you that everything your eyes see is falsehood and deception. When you look into a mirror, the monster inside it is smiling at you."
"Mirror Phobia" was widespread among new Professional recruits, but once they reached the middle and upper levels, they had mostly grown numb to it.
They had seen too many companions turn into monsters, grown used to the strange murmurs and screams in their ears, and witnessed too many physical mutations in themselves and their companions. Not using Spirit Sight when looking in a mirror had become a habit.
That did not mean Professionals in their normal state truly could not see it. Many researchers had tested it: that seemingly omnipotent "Spiritual Intuition" was actually a result of spiritual vision. Only when you could no longer deceive yourself would it be forced to emerge and warn or guide you. Whether you wanted to or not, you had always been seeing it; your flesh was merely pretending to be ignorant.
It was a creature's instinct for self-preservation. After all, "observation" itself was a form of interference, and "knowing too much" was among the top three causes of death for Professionals.
But the stronger a Professional became, the less able they were to deceive themselves.
By the Rule-level, gaining immense immortality often also meant that their flesh had been thoroughly "corrupted."
The other side of the unity of spirit and flesh, inseparable from each other, was breaking