If anything this experiment proves that it is not pleasure or happiness or experience that we desire but power. Now create a machine that guarantees us that it will increase our power over everything in the world and no one will not want to be hooked up to it.

In the simplest possible terms, metaphysics is simply about causality. The more a priori truths & causal structure you discover about the world, easier it is to predict, dominate and control it.

To truly understand metaphysics is to make progress in answering the fundamental question of metaphysics "Why is there something instead of nothing ?" If you cannot answer the fundamental question of metaphysics what is the probability you are right in all the questions that come next.

Also, something we miss out when we discuss metaphysics is our assumption that we can discuss it using merely language. When we say metaphysics what we mean is 'metaphysics as explainable using language'.