Apple’s been moving toward unifying their OSes for over a decade now. They’re playing the long game. They probably still have another decade (or two) to go.

Apple’s stance now is clear: developers need to make universal apps if they want them to run on both platforms, using tools and frameworks that are common to both. It’s much easier to make an iPad app run well on a Mac than vice-versa. I use some Mac apps that were ported from iPad, and the experience ranges from “okay” to “perfect”, depending on how much care the devs put into it. This is obviously the future of Mac software development, but it would require rewriting many apps almost from scratch. Apple’s not going to pull that rug out from under us anytime soon.

The next natural step would be to allow iPads to use the “desktop” UI of universal apps when connected to a keyboard and mouse. But I don’t think we’ll ever see iPads running arbitrary Mac apps. When I think of the Mac-only apps I use, I just don’t see how they’d run on iPad. How am I gonna run BBEdit on an iPad when there are hundreds of menu items, and a ton of UI elements that are like 8 pixels square? Never mind the lack of a real file system.

Microsoft tried this with Windows 8. It went poorly. The experience of using desktop apps with a touch screen sucks, and trying to make desktop UIs touchscreen-friendly across the board just handicapped desktop users. Apple has a better strategy here. They’re slowly molding the software ecosystem to make this Not Suck.