Interesting project, and a refreshingly simple and honest project page. Seems like the author is intending to build an operating system with it, based on the native hardware support and a comment at the end of https://weinholt.se/articles/non-posix-filesystems/ - which happens to be on the front page at the same time as this.
Cross compiles to NetBSD, can be used to fight the orthodoxy. What more could you want? :)