There are many Microsoft programs that work differently on a Mac vs Win 10. Since relatively small percentage of folks here are on Mac, I think having a Mac community would focus attention, both from users and from the folks at Microsoft that support Mac versions. If you had take up, you could have sub-communities for Teams, OneDrive, Outlook, and Office Products.
My current issue involves OneDrive, but I think relatively few people in the OneDrive community would be Mac users.
Thanks for consideration,
PS - you could make it an iOS Community too.