Fedora is, unquestionably, moving quite fast, and its base install thus has more bleeding edge packages not directly of interest to Gnome developers, but necessary for them. You *could* build the latest systemd on Debain, or just use Fedora. You *could* build the latest, I dunno, glibc on Debain, or just use Fedora. And working the other direction, if you just have (the latest) systemd, you just use it.
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