There are quite profound reasons why we should care simultaneously about having and doing. Both are connected to flourishing.
What we do with our lives is obviously central to who we are. What we expend our mental energy on, what we put our emotional resources into, where we deploy courage or daring or prudence or commitment: these are major parts of existence and are inevitably much connected with work and earning money. And we need these parts of existence in order to find proper application in activities that deserve our best efforts. We don’t’ want to reserve our central capacities for the margins and weekends of life.