Considering that Instacart allows you to add notes to your order, or even to an individual item, I'm sure this is something that can be easily resolved. Most shoppers at Instacart have paid attention to the notes, which has been great. I've run into situations where the item I ordered is not available, so they need to replace it with another item. Usually I add a note to my order that tells the shopper to always pick the smaller & cheaper substitution, since I live on my own and only cook 2 days out of the week. So my personal experience has been that it works well, but I can see how there might be variability in experiences amongst others.
