A lot of the design elements that are part of modern iOS, macOS design were first created by third party developers for free. Simple example is the sidebar [1]

A lot of the design elements that are part of modern iOS, macOS design were first created by third party developers for free. Simple example is the sidebar [1] Before it became the commonly used it is not in early OSX i twas third party libraries that would allow you do use these views. A lot of what is now macOS HIG was first made popular by third party developers (for free) then integrated into the OS X and then third party developers would migrate to the officially supported version. To pretend Apple created all of this in a vaccum is a convenient lie people tell themselves. https://developer.apple.com/design/human-interface-guidelines/macos/windows-and-views/sidebars/ https://developer.apple.com/design/human-interface-guideline...