Ya, come on Quark, though I have a sneeky feeling it's because of all the "Quark XTensions" out there that have to be ported to OSX. It's bad enough I have to keep version 4.x and 5.x because half the 4.x XTensions I use won't run in 5...
I still won't go to InDesign without a fight, after 14 years!