You misunderstood the point: it’s not physical versus digital but rather that they have no added benefits. Legal rights aren’t something only physical objects can have and ownership of a pure digital creation can be quite valuable but most NFTs don’t have that and you don’t need the expense and risk of using a blockchain to transfer them. If your goal is to show that you supported an artist, simple PKI or even a Tweet works better and is orders of magnitude less expensive because all of the value comes from a statement by the creator/rights-holder.