Many packages that depends on systemd actually depends on the logind part. Most of time you could just s/systemd/elogind/ and it will work. However for a big systemd-based distro such as Debian, that means they need to provide support for _both_ systemd and elogind for all packages, which is not an easy task (elogind basically conflicts with systemd) and not worth doing without also committing to support other init systems.