Not really, that can still be done without permissions. You WOULD be able to stop them from knowing the files are there if you remove read permissions to others

Not really, that can still be done without permissions. You WOULD be able to stop them from knowing the files are there if you remove read permissions to others, but I haven't seen this done. The main advantage I see of having them separate is that you can remove sbin from user's $PATH to avoid confusion.