Given that bmake frequently updated in base this effort seems redudant or is there anything I'm missing? It's also outdated...
Not really my place to say, I know devel/bmake is semi maintained in NetBSD's pkgsrc for the benefit of non-NetBSD systems that use pkgsrc. That may be true of ports as well. If ports is only for FreeBSD, then I'd say the port is likely redundant, all supported FreeBSD branches have bmake in base, and you generally don't need the latest. I aim to keep the main branch in base up-to-date, but generally do not touch stable branches.