This is not entirely true. You can opt out of commingling. It's true that you cannot tell if they are commingling or not as a shopper. It depends on the seller's setup but commingling has lighter labeling requirements. Depending on the product type that can either be an insignificant added cost or a significant one. For higher priced products the benefits of commingling aren't worth the risks.
Since purchasers can't tell this is basically worthless.
I always opt out of comingled but have still had products get comingled. Which makes me think that they are pretty loose with their processes and procedures when it comes to some products.
yeah you can, if the barcode of the product has been covered over with a new barcode starting with X it's seller specific inventory
That's useful, but if you don't know until it arrives, it's hard to pick the right one.