To me, this argument is like saying... C'mon Virgin, stop messing about with broadband internet services and start making my trains run on time. Virgin do both, but they are distinct business units.
Ok so OS X was delayed by iPhone, I'll give you that... But only because they were developing
software.
Second, many believe OSX for iPhone to be the most revolutionary software for mobile devices ever created, stomping on Windows Mobile and the crappy Symbiam OS.
As the lines between computing and mobile devices become eve more blurred, an OS capable of dominating both areas is surely the 'coolest' software I've seen in a while.