* God said His temple must be perfect. We don't think twice about breaking compatibility.
* One platform. x86_64 PC compatibles.
These two are at opposite ends of the spectrum.
* Ring-0-only. Everything runs in kernel mode, including user applications.
Mac OS Classic must have been more holy than Mac OS X. Makes sense, though, since everything is perfect. No need for protection.
* No networking, so malware is not an issue.
God must not want anyone sharing documents. Oh, right, the OS is perfect, so no exploits possible.