On the other hand, thankfully they haven't taken that approach, as otherwise wouldn't have been the multimedia machine it turned out to be, or have OS design decisions like its use of Libraries, Datatypes and everything scriptable that are yet to be mainstream.
With exception of a few UNIX systems like Irix, Solaris with NeWS, NeXTSTEP, Apollo, everything else tends to be the same deck of cards reshuffled.
