@Nine i don't really know the answer! i heard somewhere once that the whole mac OS X graphics stack was kind of based on postscript, which was why PDF rendering was easier and/or built-in and/or looked better on macs, but i have no idea if any of this is true! i'm pretty sure that apple was one of the first adopters of the technology, maybe they licensed it from adobe and the license was exclusive or really expensive or nobody else cared enough to want to license it