Dynamic Wallpapers
The introduction of dynamic wallpapers in newer iOS versions has been a welcome addition, offering users a greater degree of personalization. Compared to the static icons of early iOS versions, dynamic wallpapers provide a much more visually appealing experience. The design language employed is known as Skeuomorphism, which includes the use of glass, shadows, and texture to create a more immersive experience.
Flat Design
The current trend in iOS design is towards flat design, which is characterized by a lack of shadows and textures. While this style of design is certainly clean and modern, it does lack the soul of what iOS used to be. That said, modern iOS offers far greater customization options than its predecessors.
Camera UI
The camera UI of modern iOS is much more sophisticated than the single-button interface of early versions. Users can now customize the camera UI to suit their needs, adding additional features and controls as desired. This level of customization was not available in the early days of iOS, when users were limited to a single button.
App Store
The App Store was not available until after the first iPhone was released. This meant that users were unable to add apps to their device, and were limited to the apps that came pre-installed. This severely limited the capabilities of the device, and meant that all iPhones looked the same.
Icon Style
The style of icons has changed significantly over the years, from the skeuomorphic icons of early iOS versions to the flat icons of modern iOS. While the flat icons are certainly clean and modern, they do lack the soul of the skeuomorphic icons. Ultimately, it is up to the user to decide which icon style they prefer.