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"iOS's implementation of resolution independence is the best and most standardized implementation that exists."
How do you know that? You don't even know that alternatives even exist, and here you're passing absolute judgment on them? Sorry, but you're woefully ill-equipped to make that statement.
It may be easier on OS X than other platforms, I don't really know, but Mac OS X, despite a lot of talk over the last 4 years or so, remains not fully resolution independent, and the new iOS approach is a pretty big departure from what has been going on in Mac OS X.