"However, if Apple goes the MS route and demands forever backward compatibility, it's likely that OS X's advantage disappears."
Apple doesn't have MS's infinitely hard task of dealing with n variants and combinations of PC hardware and drivers. They also already dealt with major issues of backward compatibility through emulation.
Apple doesn't have MS's infinitely hard task of dealing with n variants and combinations of PC hardware and drivers. They also already dealt with major issues of backward compatibility through emulation.