Which no, haven’t gone away as the technology advanced as many people would like to believe, we’re still using displays and networking and keyboards and mice.
Do you mean not initially designed to support? Because at least for displays and networking (in the sense of being able to send X events over the network) that seems wrong, a network capable display server is basically X’s entire purpose? And for keyboards and mice there are extensions now, so x.org as a standard now very much supports those by design. Actually to my knowledge Wayland basically just forked their keyboard standard, the X Keyboard Extension.
Which X.Org was not designed to support.
Do you mean not initially designed to support? Because at least for displays and networking (in the sense of being able to send X events over the network) that seems wrong, a network capable display server is basically X’s entire purpose? And for keyboards and mice there are extensions now, so x.org as a standard now very much supports those by design. Actually to my knowledge Wayland basically just forked their keyboard standard, the X Keyboard Extension.