It’s been a busy fall for Apple. iOS and macOS 27 arrived in September, iPhone Duo went on sale just a few days ago, and more Mac announcements are expected later this week. Between the new software and hardware, there’s plenty for Apple users to explore. Of all these announcements, the iPhone Duo has arguably attracted the most attention. As the first iPhone with a fundamentally different form factor, it introduces new possibilities for how we use our phones. But new hardware is only part of the story. Just as important is how apps take advantage of it…