The value of my sharing moments of joy and sadness is that in doing so they may reach beyond the confines of this person and resonate with others. With you.
What is experienced is no longer of the moment, although there is no certainty of this. I think of art like the strings of an instrument. As one string moves, so others do in sympathy, yet something may dampen a string, by accident or intent.
Art works best for those open, that are, allow, or delight in their freedom to move with another.