They do let you choose what you want as a substitute for most things now or you can let them decide. Its also gotten much easier to reject substitutions ahead of time. At least Walmart pickup anyway. I was going to use the delivery option the first week of school because we were so busy but I couldn’t justify the extra expense to myself. Sometimes it still sounds wonderful.I used to order my mom’s groceries for delivery and I always chose “no substitutions” because of the weird stuff they would give her. It does mean you may have to pick up a few things yourself but better that letting them select what to substitute.