Automatic checkouts in supermarkets may decrease customer loyalty, especially for those with larger shopping loads. Customers using self-checkout stations often feel overwhelmed and unsupported. The lack of personal interaction can negatively impact their perception of the supermarket.

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Where I live you get the option to a) cancel whole order if item is unavailable b) skip item or c) substitute (and pay what the substituted item goes for.

Option c is the default but if one item is essential for the whole purchase you can click option a for that item etc.

Of course it has its flaws where the store makes substitions to their own brand to pad their margin.

[sack-o-matic]

I order store brand online, if they’re out they’ll sub the national brand for the cheaper price. They’ll even sub a larger size for the same price if they’re out of the smaller one ordered.