Taking advantage of different availability zones is a business decision based on cost. Of course I don't mean just cost of the servers in different zones, the h

Taking advantage of different availability zones is a business decision based on cost. Of course I don't mean just cost of the servers in different zones, the highest cost is designing and testing your architecture for the additional uptime. It's easy to say that they "should have" done it without knowing how each one of them (us) evaluated that decision.