Exactly. Also it reduces portability risk. Consider if you implement SQS and SES using their native APIs then Amazon shaft you, where do you go? The answer is r

Exactly. Also it reduces portability risk. Consider if you implement SQS and SES using their native APIs then Amazon shaft you, where do you go? The answer is rewriting everything as AMQP and basic SMTP services, which until you're done, you're down.