On top of what other said, the wayland project also maintains the wayland protocols repository which includes additional protocols that are approved by a “committee” that includes representatives from wayland protocol implementations (wlroots, kde , gnome , smithay etc). for example now they are working on color management.
There appears to be a consensus among people working on window manager implementations that X has to go and wayland is the future.
Wayland has technical benefits, if you want the nitty gritty details see this.
Basically X11 is bad IPC at this point.
Also be careful with what you read online, I see misinformation about it relatively often.