Support administrator permission: An edge case
In all modules (standard and custom) including Tickets module even if the access permission is set to Private, the support admins can view all the tickets within a department. The data sharing rule will override the access restriction that is expected to follow based on the role hierarchy.
For example, a support rep who has admin profile will be able to view all the tickets in the department, even if their role hierarchy is as follows: support manager > support rep > trainee.
This is particularly important considering that admins are involved with monitoring SLA violations, accuracy of resolutions provided to the customer, modifying process workflows, and auditing the service quality parameters.