Quite a few years ago I had the idea of a smart fridge (no doubt I wasn't the first) that read RFID tags or similar on food/drink when you first put them in and grabbed the use by date off them. Then when you opened the door/walked past, it would come up on the screen "X is approaching use by date etc". Fairly useful I think for a busy household where stuff get's overlooked and forgotten about and then binned. But that's about the extent for any smart features anyone needs for a F/F imo.