GNU Guix launches

We aren't objecting to the existence of the feature. If someone wants to implement it that is their right. What we are questioning is the marketability of the feature. It was initially described as a killer feature of Nix, but in my mind Virtualization looks a lot better for a number of different potential use cases. Other than shared hosting (which I don't have a particularly high opinion of to begin with). I'm genuinely curious what use case makes this the killer feature that really sells Nix/Guix.