Pedig csak az első bekezdésig kell eljutni:
If you are already using GNOME 3.34, then most likely your session is managed using systemd right now. For a long time now we were already running a systemd instance for every user, which is used to launch DBus and for DBus activated applications. So, with GNOME 3.34, we finally took the next step and moved the rest of the session over to run using systemd.
Ha jól értem ez annyit tesz, hogy a gnome session kezelésnek egy nagyobb részét (az egészet?) bízzák rá a systemd-re mint eddig.
Itt le is írják, hogy miért jó:
The great thing is, that this enables further improvements. There has been a lot of work to allow Xwayland to be started on demand and systemd plays a small part in that feature. Similar, we will also be able to shut down services that are only needed if specific hardware is present (e.g. smartcards). Also, using systemd it is now easy to sandbox all components which will give you an extra bit of security.