Technically, no, indeed. On paper, most (outside UNIX purists) refer to it (and MINIX) as Unix-like, as they don’t share much from UNIX outside the underlying philosophy. Ritchie himself still thought of Linux as mostly Unix in essence. Same kind of Ayckchyually, basically lol
Fair enough! I’m an English second language speaker too, I understand the struggle!
But to answer about relevance: to me, text editors are just tools. I don’t really care which one you use, as long as you do the job well. I use vim (or honestly, mostly vim bindings) everywhere I can as they’re just second nature to me at this point, and I go around text much quicker when thinking in text objects than the typical Ctrl+Alt+… and home/end/pg up/pg down shortcuts. I could just as well work with Notepad++, it’s just gonna slow me down.
So in that sense, it’s just like a pencil. Some have preferences as to which pencils they like to write with. I like fountain pens and mechanical pencils. You seem to prefer graphite pencils, and guess you probably prefer ball pens ;)