I asked on ports@ https://lists.freebsd.org/pipermail/freebsd-ports/2017-November/111067.html for alternative solutions a while back, and also noted that pf is missing from NETWORKING list. If that is a bug I'll file a PR for it too.
May I ask that in the future the title include what part of the tree is being changed? I could not tell from the email and had to pull up the revision in the web form. There are now so many differential revisions coming through that this is an annoying extra step. Thanks.