Your argument makes sense that KDE and Cinnamon can be welcoming to Windows users. However I can argue that it can also make these newcomers to keep a “windows-like” mindset and that can be frustrating.
If a newcomer comes to Gnome, due to it’s totally different paradigm, it may induce this newcomer to have an open mind and, therefore, be more welcoming to linux experience.
I don’t think one argument or the other is right or wrong. I think both arguments are valid and that’s just a different perspective. I, personally, think that a totally new paradigm is good to newcomers, but be free to disagree, since you understand that there is no right or wrong regarding this topic