Because not to see the difference between them is to deny a fundamental truth of reality -- which is, the two terms never were equivalent in the first place. They describe two distinct, fundamental orders of being, whose mutual relation makes possible the universe in which we live and move and have our being.
Since the ancient Greeks, the two orders have been described as the "physical" and the "noetic" (from nous, mind, reason). To certain Greeks, mind was omnipresent in all aspects of universal nature.
I regard that as a classical cultural clue that it might be profitable for us humans to revisit and consider these days. Especially given the presently-prevailing objective condition of general cultural disorder and mayhem.
Can't say more now. Thanks so much for sharing your view, js1138.
The non-physical mind interacts with the physical brain....maybe.