This is the reason there are cross-platform GUI libraries (like GTK and QT) in the first place. Without it them, an application must either sacrifice portabilit

This is the reason there are cross-platform GUI libraries (like GTK and QT) in the first place. Without it them, an application must either sacrifice portability, or manage the same application for multiple different interfaces over multiple OSes, like X Windows, Win32, Cocoa, and Wayland. Many applications for Windows, OS X, and Linux interface directly with Win32, Cocoa, or X11/Wayland. For example, the Foot terminal emulator only works with Wayland, because the author has chosen not to implement the X11 protocol.