If you define them that way, yes. If instead you define them as: Delete files in the application's working directory, read files from the application's working

If you define them that way, yes. If instead you define them as: Delete files in the application's working directory, read files from the application's working directory or public areas, contact websites, read keyboard when this application is the focus, send email. It isn't nearly as dangerous. Sure, you've still got the computer contacting webistes and sending email, but that isn't a terribly large risk. There is still a need for blacklisting that sort of activity. As far as reading sensitive information, however, as long as working directories are categorized well, and used by any applications dealing with anything sensitive, it isn't a problem.