I've encountered millenials who struggle with the simple concept that you can copy a file and paste it in a different directory. Zoomers my age who don't know what a file manager is. And more.
Not everyone, not even close to being a majority in fact, is an 80 year old that is completely incapable of learning basic concept. People must know the very basics of how to use their most important and omnipresent tool, such as what is a file explorer, what do we mean by file extensions, what is a file, directories, how to organize them, copy files elsewhere, why do we sometimes need to use admin privileges (and why it's dangerous), etc.