Comment # 1 on bug 1207056 from Michael Hirmke

(In reply to Dirk Mueller from comment #0)
> /etc/systemd/system.conf is recommending, rather than modifying it,  to
> create a droplet in /etc/systemd/system.conf.d/ and /etc/system/user.conf.d
> (for /etc/systemd/user.conf). 
> 
> can we please ship those directories as part of the systemd package?

Of course you can do that, but I'd prefer to create these directories only if I
need them.
Reason: I don't want to look into additional empty directories in case of a
problem.