Customize who is getting the External Sharing reviews notifications
For example, send the notification to a security governance team to review instead of Group Owners
The limitation with this feature even though it is good is if an entrusted owner wanted to share confidential data out to a source we do not trust then it is only the owner that can approve this making it easy to bypass security policies.

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Ben Smith commented
Fully agree - although not solely for security reasons, but testing the functionality prior to enabling it. We are about to implement this, however I'd like my team to simulate the end-user experience first. This is not currently possible. Being able to target the automated process for a select group and/or direct the reviews to an alternative group would be a significant help