Well, thats been tried and rejected by the user base. If you harden too much it becomes a real PITA to do anything productive (SELinux running in strict mode).

Well, thats been tried and rejected by the user base. If you harden too much it becomes a real PITA to do anything productive (SELinux running in strict mode). RHEL aims to be secure, while also remaining fairly compatible with previous versions. Red Hat do have documentation on how to harden, but most users don't use it and instead turn SELinux completely off as one of the first configuration steps.