Sure, but e.g. the documentation problems with Nix don't prevent you from working with it. While the problems make it less smooth and productive than it otherwise might have been, it might already be better than legacy systems for you.

In particular, Nix can be used in a non-invasive add-on manner on ordinary distributions. We have it installed on RHEL servers at work, where it is used exclusively as a build system and for "userspace programs" (not in the kernel sense, but in the sense of programs that are not core to the functioning of the system).