Brings back memories of the old days of the late 1990s trying out so many workstations running obscure Linux distros to actual UNIX OSes like IRIX, Solaris and HP-UX.
They all ran some variant of X11 which was part of the UNIX philosophy which I found interesting (X11 forwarding, startx, etc) but as the requirements of the desktop kept evolving over time, X11 just kept on showing its age.
Nowadays, Wayland is showing promise as a successor but I really don't have time to be messing around with these .xinitrc, .Xresources or dotfiles to get HDPI working on my MacBook these days.