I disagree that it was only during OS X. Classic Mac OS, and going back further the Apple IIs, were great for power users.<p>I also don&#x27;t understand your counterfactual. Apple didn&#x27;t build OS X from scratch, they took NeXT&#x27;s OS and ported it to Mac hardware and tweaked it. The result was something both powerful and easy to use. Making UNIX easy to use is not a trivial accomplishment! Yes, if Apple had done something completely different for their next-generation OS then maybe they would have ended up with something worse. But they didn&#x27;t.