"Unsupported" as in there are no maintainers, there's no roadmap, there's no future. X11 is a dead end. All the people who were working on it would rather work on Wayland instead. It's taking a while for the DEs, etc. to catch up, but even the slow pace of improvement Wayland is exhibiting is much better than "dead in the water" which is where X11 is.
"Unsupported" as in there are no maintainers, there's no roadmap, there's no future. X11 is a dead end. All the people who were working on it would rather work on Wayland instead. It's taking a while for the DEs, etc. to catch up, but even the slow pace of improvement Wayland is exhibiting is much better than "dead in the water" which is where X11 is.