Apparently even other distros had similar issues:
https://bugzilla.redhat.com/show_bug.cgi?id=2325780
systemd just merged a fix that should remedy the boot hang issue:
If it is the same thing that was effecting them, it should be fixed real soon when the new version is available. (I see systemd 257.1-1 is already in Core-Testing)
Just glad the work around is very easy to do at least. Only if other issues were worked around simply by pressing any key… 