Parmigiano-Reggiano makers are putting edible microchips the size of a grain of sand into their 90-pound cheese wheels to combat counterfeiters::Italian Parmigiano-Reggiano makers are using microchips to verify the authenticity of their products and thwart scammers.
I think the problem is more that they don’t want to have to do those things on every single wheel, the microchips make identification easier. Also worth noting that many things can be physically and/or chemically identical but still have different value due to the way it was produced, some things that come to mind are power and hydrogen. They can both be produced in many ways, with some in more environmentally friendly ways than others, and the consumer may care about that.