i3 explicitly had a IPC interface separate from D-Bus: "Implement an IPC interface for other programs. Provide subscription to certain events and accept comman

i3 explicitly had a IPC interface separate from D-Bus: "Implement an IPC interface for other programs. Provide subscription to certain events and accept commands. This approach should be more lightweight than wmii’s usage of the 9P filesystem. Furthermore, core functionality does not depend on a separate program, so that i3 runs faster, especially when your system is under load." https://i3wm.org/ https://i3wm.org/ It just is designed for scriptability: http://i3wm.org/docs/ipc.html http://i3wm.org/docs/ipc.html.