>If you're not careful, and your centralized system injects dozens of minutes of delay due to the additional complexity of performing the global optimization, y

>If you're not careful, and your centralized system injects dozens of minutes of delay due to the additional complexity of performing the global optimization, you end up with the globally optimal decision from 20 minutes ago, which in the context of, say, load balancing is an eternity. That actually doesn't seem avoidable, because some of this time will need to be spent identifying risk and malice/corruption.