X got to the level where it "just works" for me few years before wayland. There is no reason to change and it has more drawbacks than benefits. It also have a

X got to the level where it "just works" for me few years before wayland. There is no reason to change and it has more drawbacks than benefits. It also have a lot of very brain-dead decisions like moving a lot of what X did to the external tools and so now everyone making a desktop environment needs to worry about handling various input configuration or even to have working screenshots. X might be crufty code-wise but it was right level of abstraction, allowing WMs and tools built above that to not care all that much about hardware and remain relatively simple.