I think nobody really argues that X11 is outdated and should have had a successor by now, just that Wayland turned out to be a bad replacement. There is actual

I think nobody really argues that X11 is outdated and should have had a successor by now, just that Wayland turned out to be a bad replacement. There is actually a really good point in the article that "(desktop) Linux isn't a platform", but instead a fragmented mess of individual frameworks and systems (which after the Wayland transition may or may not eventually reach feature parity with X11 again). This fragmentation in the Linux desktop world is indeed the core of the problem which Wayland should have helped fixing instead of making it worse by spreading functionality that was centralized before over even more unrelated systems (meaning just more things that can individually break). Compare that to non-desktop Linux, which actually is a platform (and because of the simple "Don't Break Userspace" rule has wiped the floor with other operating systems in data centers).