Enable group calendars in Macos and iOS calendar apps
The group calendar needs to be available in the native calendars of Macos and iOS, so I don't have to use separate apps or be confined to Outlook for the group calendar.
Group calendars need to be able to be viewed on other devices. Forcing people to log into a web browser to see group events is not a good workflow as people rely on their calendars on whatever mobile device they have. All Calendars (User, Group, team, etc) should be able to sync for the user to their preferred calendar viewing app.
E H commented
We currently have users on macOS and iOS using the native calendar and reminders apps. Being able to integrate the Office 365 group calendars would help them with their scheduling and avoid a bunch of retraining (and other such hassles - users want to use the tools that work for them, not learn a new one).