[1] Supported is something of a misnomer here given Fedora by its nature is unsupported, but for sake of argument think "We'll investigate this bug if it gets filed in bugzilla.redhat.com"
Actually the problem here is that these bugs appear to be regressions in the fedora _installer_ (which is why they were filed against anaconda). That is, they are not related to kernel bugs (you cannot even install reiserfs with selinux *disabled*). But they are summarily closed WONTFIX which I find troubling.
the same is true for reiser/xfs/etc bugs in the installer. Unless they come with a patch, they're not getting attention by RH folks.
Does that make them second class citizens? Only partially. If nobody else cares about them enough to make a patch either, then yes they end up being second class citizens. Otoh if someone else stands up and starts caring, they aren't.