But a fridge that’s clever enough could also over-ride the carton’s marked expiry date. The algorithm might be based on a combination of date of supply from the RFID chip, ambient outdoors temperature from Met Office statistics (being exposed during briefly during the shopping trip), and actual fridge temperature. 
That said, one disclaimer.... milk does have a ‘use by date’, rather than ‘best before’. As a rule,‘best before’ can be taken with a pinch of salt, whereas ‘use by’ such as marked on the milk in my fridge, should be taken more seriously.
Yeah I know the difference between Use By and Best Before, but even the Use By is based on being stored in accordance to the instructions, average fridge temperature. Mine is set so cold, sometimes the top of the milk freezes.
A big problem as well is home delivery doesn't guarantee a good date. What good is a weekly shop when there is only a slim chance of your delivery having a week on its date.
Like I said, automating shopping is clearly a very middle-class idea, because it doesn't factor in budget shopping or the complexity of allergies, reactions with medication, etc. When not all items even have their ingredients itemised as it is, its a far more complex issue for some of us than is being made out. Then there is the fact our deliveries are also based around the cheapest delivery date/time. They can't even manage suitable substitutions when you are directly interacting on the website, how is an automated system going to work?
It would take a huge shift in how home delivery is done for it to be automated as everything expires on different days, plus how does it factor in best before dates, where you get a few days leeway?
They've been talking about RFID tags to automatically detect what is in your fridge/pantry for over a decade already.
