I dont think it applies to every version out there. It should have been bug on fewer version ? Maybe !
I tried out on creating a dummypool with dummymonitor on Common partition.
For example, a user with the Manager role, who can access partition AppA only, can enable or disable monitor instances for a pool that resides in partition Common
Created an AppA partition, created an user with role Manager and assigned AppA partition alone.
Tried going to the instance section, I dont even see a check box. There's no option to delete the instance.
Have you tested out ?