This blog goes more in detail on the EBS-Optimized burst behavior https://aws.amazon.com/blogs/compute/improving-application-performance-and-reducing-costs-with-amazon-ebs-optimized-instance-burst-capability/. We have burst balance metrics which help customers evaluate whether they can size their workloads based on burst performance.
Customer can drive sustained burst performance for 30 minutes, after which the performance will drop to the baseline. For example on the r5.2xlarge customer can drive sustained 4750Mbps for 30 minutes. Most customer applications don't drive sustained workloads and such applications would always have burst performance available. I would recommend customers test their workload and monitor the instance burst balance metrics to determine whether it meets their application demand.
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