If I have to choose I will call Linux UnixLike/Posix . GNU is a temporary (but important ) help in the history .
But that's factually wrong.
POSIX defines an entire OS including a set of system interfaces (libc functions), but conveniently leaves the kernel part (syscalls) unspecified, so that it can be implemented the way you want, as long as the userspace is compliant.
Calling GNU "history" is also quite misguided, as they still make/host stuff that's hard to replace or considered leading in non-standard features (ncurses, make,
gnuplot, tar, gnupg, emacs, grub, gnat, gmp/mpfr/mpc/mpria, octave...) and the GPL is still the license that made it.
GNU have no "rights" on Linux movement . Hurd (and not Linux) is the choice of GNU as kernel.
My first point is that there is no "Linux movement", Linus even said himself that Linux won't be
"big and professional like gnu". It's both the free software movement and enterprise "open source" movement containing Linux.
I think that audio community have no interest of this ideological/religious war . So can you avoid to talk about ?
Come on, you wrote such a big reply, I can't just ignore you (and you completely ignored my first point). Anyway, I'm not even a GNU follower, I'm more in the suckless camp of "you don't deserve computer freedom if you're not ready to make some efforts".
And it's still not working.
Actually, it does "work", but yeah, it'll never be a serious contender. Like all the kernels that want to be used in mainstream settings, death by (lack of) drivers.