Perhaps Netflix merely made a judgment call about the amount of effort required to be able to migrate 100% of their production traffic from one region to anothe

Perhaps Netflix merely made a judgment call about the amount of effort required to be able to migrate 100% of their production traffic from one region to another in event of downtime. It sounds like they came to a different decision than Quantcast about the importance of being able to do so. Which is more likely - that the thought of an AWS outage like this never occurred to them, or that they judged the specific remedy needed to overcome it not a high enough of a priority to have it available within the first years of their AWS usage?