With this change, the power button and volume buttons on the iPhone 15 Pro models won’t be physical buttons. Instead, they’ll be solid-state surfaces, and when pressed, Apple will use the Taptic Engine to simulate the “clicky” feeling of a real button.
If this sounds familiar, it’s because Apple did the same thing with the physical Home button starting with the iPhone 7. That device, and subsequent iPhones with a Home button, used a solid-state design rather than a physical button that actually moved. The company also uses a solid-state design with the trackpad on recent MacBooks.