Fang Xing clearly understood the weight of Bai Qianzhang's insight.
In the current cultivation world, there are few left who can guide Fang Xing, because the path he walks is too extraordinary. The path of the Immortal Infant is one of transcendence; although powerful, it is fraught with peril. Unless he acquires Ancient Heritage, there's no path he can follow, as the world's rules changed drastically after ancient times, making cultivation difficult, with no more Immortal Infants appearing. Once he embarks on the Immortal Infant's path, his journey will differ from that of his contemporaries, requiring self-exploration. His reluctance to form an infant is partly because of this. In terms of cultivation, the Flying Roc Demonic King, Elder Hu Qin, or Old White Ape of Great Sage Mountain are all far ahead of him, yet these elders cannot guide him on his path, as they walk different paths.
