Sematic arguments of GNU/Linux aside, that 'real-ness' has actual implications on time-to-market and resources needed. The Maemo platform has a huge edge because of that. How long did it take a PDF reader to show up for Android? How trivial is it make a PDF reader for Maemo? I blame that on Dalvik/Android.

Apple is king of the (initial) user experience. But user-experience isn't everything. The dominance of windows should demonstrate that there /are/ other factors in play.