As much talk (some justified) about Apple turning into a totalitarian Evil Empire, people forget that Adobe's mindset is from the print world, where it's commonplace for a single, proprietary company to control a functionally-optionless standard. Pantone, PDF, PostScript, press vendor lock-in.
Most design shops are strictly Mac or PC and stay that way. Not because of personal preference, but because they generally own $30k in fonts incompatible with a different platform.