Documentation should specify that not all the supported filesystems and format combinations can be used in RWX mode https://docs.redhat.com/en/documentation/openshift_container_platform/4.21/html/virtualization/managing-vms#vm-disks

A disclaimer like in https://kubevirt.io/user-guide/storage/disks_and_volumes/#disk-sharing should be sufficient -> "Shareable disks demand either data synchronization at the application level or the use of clustered filesystems. These advanced configurations are not within the scope of this documentation and are use-case specific."

ie: XFS format is not RWX compatible and should not be used. Data will corrupt if more than one VM writes to it and only the VM that wrote the data is aware of its existence

1.
2.
3.