Mac is not an alternative functionality to: Teams, Outlook, MS Office, etc? It doesn't solve the MS crappy auth system, it doesn't give (large) businesses the same functionality that MS is giving them.
On the Mac, you can use those MS products without it taking over your user account.
You can also use any of various other products that compete with them (Google Apps, iWork, Zoom, etc).
Just because MS makes a specific package that businesses like doesn't mean that they can't use something else if MS is becoming more of a problem than they're worth.
Mac is not an alternative functionality to: Teams, Outlook, MS Office, etc? It doesn't solve the MS crappy auth system, it doesn't give (large) businesses the same functionality that MS is giving them.