There are no X11 maintainers, there’s nobody to block out. In terms of users, of course there are X11 users. But nobody is maintaining it in any meaningful way and it’s been that way for years.

Also sysvinit is straight up obsolete software. Even if you hate systemd, there’s just no reason to use sysvinit because things like OpenRC and runit exist.

In addition, the adoption of systemd has lead to needing to maintain less init scripts because systemd units are just more portable. It used to be that every single distro and even versions of that distro required specialized init scripts for every application.