These systems are the most frustrating to me, because it is the unusual transactions that are more important than the usual ones. If I have eggs delivered ever

These systems are the most frustrating to me, because it is the unusual transactions that are more important than the usual ones. If I have eggs delivered every week, and one of those transaction fails, who cares? If I buy a plane ticket for a flight that leaves in 30 minutes because of an emergency, I will be fucking enraged if that transaction is blocked. Similarly if I can't pay the hotel at check-out and because of this delay I miss my flight. Or when I arrive in a new country and can't pay for the taxi ride, and the ATMs don't work either. All these events have happened to me.