I think you're going to have to put logs up somewhere and
configuration information somewhere to get an answer. I can tell you
that mdadm raid and lvm being used do not themselves result in an
inability to shutdown Fedora. Fedora by default uses LVM, and mdadm
raid0/1/5 tests are done on pre-release versions of Fedora; if any of
that resulted in an inability to restart or shutdown, it'd likely be a
release blocking bug. So the mere fact systemd itself does not
directly support md raid or lvm doesn't really translate into a cause
of your problem.
Chris Murphy