But whose fault would that be, if not his? Wouldn't it be the job of the head of iOS development to identify the ideas worth pursuing and setting the teams/projects/schedules accordingly?

If the guy ostensibly setting the feature list sends out an email saying "you guys aren't making the right stuff" ... how can you parse that in a way other than "asshole"/"not taking responsibility"?

Or does Apple have an internal project structure more along the lines of Valve?