It's just a safe pattern that's easy to implement. If your services back-off attempts happen to be synced, for whatever reason, even if they are backing off and

It's just a safe pattern that's easy to implement. If your services back-off attempts happen to be synced, for whatever reason, even if they are backing off and not slamming AWS with retries, when it comes online they might slam your backend. It's also polite to external services but at the scale of something like AWS that's not a concern for most.