Apple got into sound design in one of their WWDC videos, and talked about how designing sound is important. I feel like we might see a huge update to the system sounds and sound effects. Especially after hearing the new supposed iPhone sound effect for wireless charging and the leaked HomePod sound effects. If I recall correctly, they didn’t announce the new revamped sounds for iOS 7 until the iPhone 5s keynote. Hopefully they update it for macOS too.