Given major corporate data breaches around the world, passwords are a minimum in today's environment.
SOX 404 requires compensating controls for IT security risks. The main risk that is focused on is password protection of files.
Even though Tableau Server has the ability to prevent people from accessing published files, we still need to be able to lock Tableau Desktop files that are not published.
Even having the ability to make the file "Read-Only" would help with this as well.