Currently for embedded view there is an option to show single category. In which the matching category is shown in embedded view.
On many occasions there is a requirement to show multiple categories for example when designing a form to show task on my desk, there are documents in which the current user have rights based on his notes name, groups he belong to or roles he has in the application.
Show single category does not full fill the requirements as we want to see all documents where current approve is defined as notes Name or group name or user role.
Having an embedded view with show multiple category will solve the problem, where giving a multi value field will show the matching categories