While I totally see your point, humans are direction-based creatures. While the achievement of a goal might not bring any new joy, the process of achievement is what keeps us in the correct "flow"

Without direction, life falls apart and despair/depression sets in.

Again, direction needn't mean some lofty material goal. It can be as holistic as "I want to construct a lifestyle for myself where I get to do all the things I want to do without stressing about money"