In order to enable group members to create and use folders and inbox rules, Microsoft recently released a critical upgrade for Outlook Groups. A Microsoft 365 group called Outlook uses email for communication. When Practical365 last considered the issue of using Groups versus shared mailboxes as the foundation for teams that needed to share email (in November 2017), the conclusion was "it depends." Because each choice featured some distinctive capability that would make a difference in specific instances, the typical consultant advice was the outcome.
https://practical365.com/outlook-groups-vs-shared-mailboxes/