Couldn’t disagree more. Do non-techies need anything more than a browser nowadays? Maybe a word processor? The process of turning on and opening a web browser on Mint are practically no different from Windows. Hardware will plug and play just the same. Using printers is equally intuitive (ie, not very). In fact, I can find firefox on GNOME by just pressing the Win key and typing “internet” or “browser”.
Both are probably equally likely to run into incomprehensible tech problems that require techie intervention.
I still don’t see how it’s any more confusing than Windows. Cinnamon does it almost exactly the same way as windows, and typically detects network sign-in requirements better. Auto-updates work absolutely fine, and again I’ve not seen them need manual intervention with any more frequency than Windows.