This is where there is a division between the way the FSF presents itself, and the way the software is used. Without a kernel, the claims that GNU is a replacement for UNIX is disingenuous. GNU Hurd is not production ready. It is a series of tools, some of where adhere (mostly) to the POSIX standard, and some of which provide other functionality.
If we're going to start naming systems based on the tools, then I use a ZSH/MS/VIM/PSF/Linux distro. There are other providers than GNU.