MacKinnon’s alternatives to materialism reminds me of Alexander Stern’s proposals to counter identity materialism in “Authenticity is a sham” - historical awareness, acknowledging the constraints of time and place, and learning a craft. https://aeon.co/essays/a-history-of-authenticity-from-jesus-to-self-help-and-beyond
Dunno if “identity materialism” is a thing but trying to name this idea: “Today, one of the primary ways we deal with the anxiety of being ourselves is to construct fantasy versions of ourselves through acquisition. This includes not just the acquisition of stuff, but also of personal style, worldviews, sociopolitical identities.”