This set of facts comes to light every 3-5 years when US-East-1 has another failure. Clearly they could have architected their way out of this blast radius problem by now, but they do not.
Why would they keep a large set of centralized, core traffic services in Virginia for decades despite it being a bad design?
Why would they keep a large set of centralized, core traffic services in Virginia for decades despite it being a bad design?