Xcode 12 tabs
Up until Xcode 12 was released, Xcode tabs were a pretty terrible user experience, especially if you also regularly used an actually good code editor like Sublime Text or Visual Studio Code and knew what a good tabs UX was like. In Xcode tabs you could open the same file in 2 (or more) different tabs, for instance, which is close to useless. Xcode tabs worked pretty much like document tabs in any other application. »