The connection drops at the worst moment: peak hour with a long queue. If the till stops, staff go back to pen and paper, handwritten orders never reach sales or stock, and the cash taken does not match the drawer at night. And if a system resends without safeguards, one order can be counted twice.
In Loqma, the till is built on the assumption that the internet will drop: the order is kept on the device, the kitchen gets its ticket, payment is recorded on the order itself, and when the connection returns each order arrives exactly once, with its money and the shift it was sold on.