Similar atomicity concerns apply here as for https://bugs.freedesktop.org/show_bug.cgi?id=69096 (especailly as --create can be destructive by truncating files).

Note that tmpfiles is designed to be run at boot-up (and possibly package installation time), but not each time a service is started (this is for security reasons as creating fixed name dirs in /tmp is only safe if it is done before the first user logs in).

Also, there is currently no explicit connection between tmpfiles snippets in unit files.

We generally recommend packagers to invoke tmpfiles in the postinst scripts of the package. For RPM we even provide a spec file snippet for that in %tmpfiles_create.