Contrast this end-user experience with that of Steam's. These are essentially the exact same applications except that Steam has 1) carefully cultivated a huge, multi-platform ecosystem of apps and 2) has never willingly broken the application's environment.

Steam is arguably the only game distribution platform of significance (yes, yes, battle.net and its limited selection of widely played titles) and will continue to dominate because of the careful thought they've put into distribution.

Seems like Apple should take a lesson, no?