You do point out an interesting problem, which I've also alluded to. FreeBSD 12 on the RPi is "supported" in the sense that (a) it works, and (b) there are people who work on improving it, packaging it, and helping when problems occur. What is still missing is a centralized single place with all the instructions, downloads, restrictions, FAQs. The other issue is that discussion and assistance is spread over multiple things (forums, mailing lists), although that is harder to fix, since the issues are a mix of hardware-specific issues, integration of OS on hardware, and OS-specific issues.
But with a few hours of patience, one can untangle all of that and get the RPI to work under FreeBSD.