I live in a cave and am not a system programmer -- what's so wrong with X11 so people need to replace it with something else instead of improving it? Or, what's so wrong with anything so people need to replace it with something else instead of improving it? Let's say I'm an old man favoring improving existing stuffs instead of starting from scratch. I like debugging and wish to work as a sys programmer specialized in…
Tech debt. The X11 dev have thrown the towel and have prefered working on something they deemed more maintainable.