So what? No one is disagreeing with you about that. The thread was about adding fine grain security controls to traditional OS filesystem access. I was just using iOS as an example, I could just have easily talked about containerization, as a security solution. Of course all those solutions are more limited than a local filesystem—the entire paradigm is designed around full control, you can't bolt on granular security. Heck, even basic UNIX permissions are pretty janky and unmanageable, but at least they more or less work everywhere since they've been around forever. Inventing something now is guaranteed to be annoying and useless.