ArcGIS Server 10.2: Is only the user-role-type restrict to a specific service?

Discussion created by harley on Aug 8, 2013
Latest reply on Aug 26, 2013 by ichivite-esristaff
This is perhaps semantics, but maybe I am not using the roles correctly.

There are 3 role types, but only the ???user??? role type can be used to provide read privileges to private service.

3 user role types can be assigned to a specific service:
Group-A -> Service-A
Group-B -> Service-B
Group-C -> Service-C

users in Group-A cannot use Service-B or Service-C

But publisher and administrator role types provide access to all services and can give access to anyone.

Publisher types assigned to a specific Service:
Pub-A -> Service-A
Pub-B -> Service-B

Administrator types assigned to specific service:
Adm-A -> Service-A
Adm-B -> Service-B

Is there any benefit to having more than one publishing or administrator group?