Let's assume if SIP is disabled and permissions get either maliciously or intentionally, but misguidedly changed. How to restore these permissions to their factory settings?
What is the Current Best Practice to Remedy Such a Situation, Once it has Occured?
It doesn't really matter exactly how a Sierra installation might end up with less than ideal, 'broken' or 'breaking', or simply altered permissions on its system files or directories.
The question from the title is in slightly longer form:
How do you reset the file system permissions in Sierra that are relevant to the systems operation to their default settings?