I heard that from a GNOME developer at a conference. I do not remember the
details. I guess it has to do with things like closing the lid of your laptop
(what suspends it by default) while the system is shutting down. If you have
ever tried that with Trisquel (which currently uses ConsoleKit), you have
probably discovered that the system may be stuck and need a hard reboot.
logind brings cool new features too. Multi-seat (many screens, keyboards,
mouses, etc. for one single machine) for instance. According to
https://wiki.freedesktop.org/www/Software/systemd/writing-display-managers/ :
systemd's logind service obsoletes ConsoleKit which was previously widely
used on Linux distributions. For X11 display managers the switch to logind
requires a minimal amount of porting, however brings a couple of new
features: true automatic multi-seat support, proper tracking of session
processes, (optional) automatic killing of user processes on logout, a
synchronous low-level C API and much simplification.
