If you did not divide up the consistency groups, you would not be able to use your run data in your disaster data center for any period that your install or configuration data is inconsistent.

SQS follows the model of "eventual consistency," meaning you can send a message to the queue, but a consumer of that queue may not see the message for some significant period of time.

If such limits are approached frequently and over a long enough period of time, the body's ability to adapt is exceeded, recovery is greatly delayed, and training consistency is interrupted.