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Slowly but surely Apple has become less reliant on the iPhone. Many people talk about software as their next big profit driver, I do agree with this but don't underestimate the accessories division. This Business Insider article points out that accessories sales have doubled since 2015 after going through a serious slump because of a decline in iPod sales.
AirPods, HomePods, Beats, Apple TV and the Apple watch all fall into this category. More importantly these hardware devices all keep clients in the Apple system and consuming Apple content.