Debian provides systemd as an "extra" package - the lowest priority tier below the "optional" packages.
This is because it conflicts with the sysvinit package, which is "required", so Debian policy requires that the systemd package be "extra". It does not mean that the Debian project considers systemd unimportant.
It is not entirely unlikely that at some point these priorities will be reversed, at least as far as Debian GNU/Linux is concerned. There are many Debian developers who rather like systemd.
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