Agreed whole-heartedly, and one of the reasons I love the FreeBSD model. My ideal Linux distro would be the inverse of Debian k/FreeBSD – a Linux kernel with FreeBSD kernel interfaces provided by loadable module and a FreeBSD-style userland.
Might be possible soon, now that building Linux with clang is supported.
Huh. There are already others implementing the Linux ABI, but I can only think of NetBSD rump kernels and some Plan 9 thing...vx9? going the other way. No reason it shouldn't work.
Edit: Oh, and Darling runs Darwin binaries on Linux, which isn't quite a BSD but is non-Linux
Might be possible soon, now that building Linux with clang is supported.