How Apple is building devices for longevity

One thing I've always appreciated about my Apple devices is how they seem to last a long time. As someone who writes about technology, I'm regularly one of the first people in the Apple Store on launch day to get the latest iPhone. I've never felt bad about getting a new device every year, because I never just throw my old phone out. I either give it to a family member, use it as a test device, or sell it. When I replace a family member's device or no longer need the test device, I sell, trade-in, or properly recycle it if the life span has been reached.