A materialistic outlook misses so much. As does an emphasis on concrete reality or causality.
How would you explain love, for starters? Much less admit passion? Why does music move us the way it does? And pain, be assured, is more than a neuro-chemical calculation. Why does social injustice to others spur our own anger? How could those who own all the creaturely comforts ever feel lonely?
The materialistic reaction to these, I suspect, prompts what we call addiction. Though it’s not always to alcohol, tobacco, illicit drugs, food, or even sex.
For liberation, a spiritual dimension will open. Or else.