Question about External MySQL + --unmanaged=false

Hello, I wonder it is possible to operate External MySQL with --unmanaged=false flag.

I consider to operate with my own vanilla MySQL to manage mysql myself(init/start/stop..), not with vitess and want to use vitess management features(reparent, reshard, replication, ...) except backup/restore.

I wonder there is some potential problem and usecase like this.

For example,

vttablet:
              extraFlags:
                db-charset: utf8mb4
                log-format: text
                unmanaged: "false"
              resources:
                limits:
                  memory: 256Mi
                requests:
                  cpu: 100m
                  memory: 256Mi  
            externalDatastore:
              user: vt_dba
              host: targethost
              port: 3306
              database: vt_test

Start by tracing how the operator handles the vttablet unmanaged flag together with externalDatastore. Determine whether an externally managed vanilla MySQL can still support reparenting, resharding, and replication while excluding backup and restore; document any limitations or required changes.