Knowing how to copy and paste or which button to click to close a window is negligible when compared to the training required to properly use an ERP or even the most unique features of, say, Excel.

Anyone capable of navigating their way in Outlook can probably navigate their way in Apple's Mail or Thunderbird or Evolution. Anyone familiar with LibreOffice can do the basic stuff in Numbers in minutes.

Now, if you want a Notepad user to become proficient in Vi, that's a whole different story. Gedit, OTOH, is pretty easy.

Vi (or gvim) is too easy by comparison. Making them use emacs would be a whole different story.

That's an apples to oranges comparison. Emacs is an operating system, not a text editor like Vi. ;-)