Exactly, except Microsoft has taken it to the logical conclusion we all want supporting all platforms, and sadly Apple hasn't. I have code that runs on both iPhone/iPad and shares most of it with the Mac version yet I have to build the Mac as a separate app and submit to a different store. That sucks.
Totally.. see the appearance of TextKit on iOS using tons of NS* classes instead of UI* classes, and UITextAlignment being replaced with the OSX NSTextAlignment, etc.
I doubt its a very high priority though given how small the OSX Desktop market is in comparison.. it'll just be a very slow merging ;)
