John's response outlines his experience with UI development using XML and Jetpack Compose, which is relevant to the question. He provides examples of UI elements he has worked with, such as text fields and buttons. However, his response lacks detail regarding system-level UI elements, which was a specific interest mentioned in the question. To improve, John could discuss any experience with notifications, system dialogs, or other elements that interact with Android's system services, as well as the challenges and considerations when designing these components, as demonstrated in the benchmark response.