Philosopher Susan Wolf talks about the "meaningful life" as, "lives of active engagement in projects of worth." A classic example that is given about how important both are is the idea that while one can actively engage in digging a hole in their backyard, it won't lead to a "meaningful life" because it's not a "project of worth."

This hobby I suppose could serve either as a strong counterpoint, or would reveal a whole bunch of empty souls. Up to you to decide which.