Are we being overly anal about semantics here? I never said kde is a distro. I just said I used Ubuntu, as in the pure Ubuntu from Canonical, and before that Kubuntu, or Ubuntu with the Plasma Desktop environment KDE. There, it has been a long time since I last used them so I did not remember the name Kubuntu.
Also MacOS is popular because its users don’t have to care that it is a Unix system. You basically just repeated my point. I have never been an Apple fan (my phones were all Android phones), but, well, “it just works” anyone?