boasting features like song-sharing that Apple still hasn’t managed to catch up to.
Don't be silly. Apple hasn't "caught up," because it was never behind in some kind of race to add song-sharing. Apple chose not to implement that feature, as it has chosen not to add a great many other features.
If you think it's a benefit, it's appropriate to praise Microsoft for adding it, but you shouldn't imply that Apple is staffed by hapless engineers that are somehow incapable of figuring out how to implement this feature, or that Jobs sends out a weekly email asking when this feature will be ready.