There is only one truth which is that without suffering there is no joy. Enlightenment is a double edged sword, because the goal of the path to enlightenment is to end suffering. Therefore there can be no joy. Once Enligtened Everything simply becomes filler and nothing matters.
Nothing matters if you want to end suffering because then there is no joy? You're argument seems flawed. Why does joy stop being experienced if suffering of extreme degrees is removed for the most part? The absolute of removing all possible suffering is impossible,because anyone can subjectively suffer in consciousness, in psyche, of their own doing and influence without anyone doing anything to them.
Yin and Yang are not flawed and it’s not an argument. Likewise there is not good or bad without fealty to a fictitious law to become sentient.