You seem really fixated on Plan 9. I merely used it as an example to show how even ultra-niche operating systems have support, demonstrating how adding a target

You seem really fixated on Plan 9. I merely used it as an example to show how even ultra-niche operating systems have support, demonstrating how adding a target need not be a monumental task. Other operating systems like FreeBSD, NetBSD, Solaris, OpenBSD, and DragonflyBSD also exist. FreeBSD is quite relevant and NetBSD and OpenBSD fill almost-empty yet significant niches.