Porsche has not chosen to say that the Carrera performs best with a manual transmission and that, therefore, they do not offer it with automatic...a position that is diametrically opposed to that of Apple which has chosen to say that Macs and OS X perform best as presented, and if there's something you don't like, well...tough darts
I'm not sure what a "manual transmission" version of a Mac would be but, since a transmission is associated with operation, it's fair to say that a manual version would involve getting to the same place but with more effort.
In that case Mac actually is a Carrera with both automatic and manual operating modes. You can do it the Mac way (automatic) or you can choose to run Windows (manual) on the same machine - with software provided by Apple.
ryck
