Exactly. Online grocery ordering still has a significant problem: accurately delivering on a customer's wishes.

It's a complicated problem. Customers have various "squishy" preferences - your bruised apples may be fine to me. Customers also have dietary restrictions that they just can't have. In-store inventory (esp fresh items) is constantly changing and may not be up to date. Items can easily look similar but are actually different in grabbing the wrong item or substituting.

When you go to the store, you can get exactly what you want. Until that problem is solved, grocery delivery will always be a minority.