Managed disk snapshot governance should be integrated with Recovery services vault.
There are many applications that aren't VSS-aware. There are many Linux workloads like Openshift that are incompatible with Azure backup. However they are compatible with Managed disk snapshots ie. the application doesn't break when restored from snapshot but does when restored from Azure backup. The snapshot governance should be as granular and sophisticated as backup's
Jonathan Pritchard commented
And we should have GRS support for the underlying Managed Disks to be available for restore in a separate AZ/Region