We know the difficulties we experience. We are directed toward enlightenment by the Dharma. If we do not survive then existence ceases. Survival may also shape our basic understanding of self. If we understand how powerful this drive to survive truly is, then we can begin to put into perspective the difficulty of becoming Buddha and how fundamental this process is.
Existence provides a place through which values can be expressed.
Without existence there would be no you or I to discuss or manifest the merits of compassion and wisdom. But this self that craves existence is not necessary to exist. The end of that self leads to enlightenment. As a foolish being, unable to relinquish self, the compassionate promise of Amida, frees me to see what Shakyamuni saw at the time of his enlightenment. Although my mind is not yet demolished, the mind of Amida contains me and moves me toward enlightenment.