I don't get your point. Are you saying that Apple can sell more specialized iPhones?
But that's exactly what is the problem with modern Apple - software is shit. It's limited on purpose, so that the users are forced to buy more Apple devices. So no, they don't need to sell more iPhones, they need to make their software better, so it won't be like a cult where you need to keep buying a bunch of different devices. But then they won't get easy money from the followers, so they will never do this.
But that's exactly what is the problem with modern Apple - software is shit. It's limited on purpose, so that the users are forced to buy more Apple devices. So no, they don't need to sell more iPhones, they need to make their software better, so it won't be like a cult where you need to keep buying a bunch of different devices. But then they won't get easy money from the followers, so they will never do this.