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What does this bring to the table that CloudWatch scheduled events don't already provide?

https://docs.aws.amazon.com/AmazonCloudWatch/latest/events/S...

This library dynamically manages the CloudWatch scheduled events. So you wouldn't have to create the Rules with aws-cli or aws console, but make a simple call to aws-lambda-scheduler lambda function.

To answer your question:

+ deletes the expired rules automatically.

+ new rules can be created with a simple lambda call.

+ there can be maximum of 300 EventBridge Rules in a region, aws-lambda-scheduler introduces optimizations to work around this limitation.

it's basically a cli to create those. just that.