Sure. And to be even more fair, let's acknowledge that iOS's security success has propelled new features in mainstream OS X as well, such as the App Store and Gatekeeper. Others such as Microsoft are paying attention and are implementing similar walled-garden-ish provisions as well. For most users, that's a significant security bonus. (For power users who know what the risks are, Gatekeeper can be loosened or turned off.)
It would be nice to see Apple get some credit for pointing the way to improved security, including innovations such as their impressive implementation of Touch ID and the deep security integration in Apple Pay. Certainly Apple isn't the only font of security and privacy innovations in the computing world today, but they've made some significant contributions to the art which should be acknowledged. The list also includes FileVault 2, the Mac's excellent whole-disk encryption system, which is a no-extra-cost built-in feature of OS X and exacts no perceptible performance hit. And, since data loss through physical damage or theft is the biggest threat to most folks' files, a tip of the hat is due to Time Machine too, and also the built-in recovery volume in every recent OS X machine. And then there's OS X's ability to be reinstalled in-place without wiping all the user's data... an un-obvious but valuable bonus that can get a compromised machine running again.
Now if we can only do something about the insecure wetware that sits at the keyboard! That remains the biggest threat, regardless of platform.
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Most corporations have strict policies against installation of unauthorized software. Yet anti-virus is still a practical requirement for Certain Platforms. It's hard to square that with what you just said.