Linux is also a collection of distros. We don't call them GNU/Linux distros (because they don't have to be using GNU. Linux is just the broader term for the community and the distros the community uses. My point, clearly, is that the GUIs that are provided on the distros or in the repos, or by the community all are terrible. If you want to be pedantic further feel free but I'm not going to engage in a semantic war.