Is this a strategy of Apple (or Intel) to be able to get people to ignore (and therefore they can optimize the cost of) the generation of chip used? It's almost as if they realized people fixate on the GHz figure, and overlook the chip generation, which (I guess?) must contribute much more to effective clock speed than a small difference in Hz rate? I even fall into this trap sometimes.
It is a bit complicated for the casual buyer to have the clock speed which was the previous metric of "goodness" of your machine now have to be weighed with the generation of processor. When the name of the processor itself doesn't provide clear differentiation between generations.