Well, my dad updated his and mum's computers to Win 10 (from Win8 and Win 7 respectively). Mum now can't use her PC because nothing is where it was, what's these tiles for? etc.
Microsoft seriously needs a Windows 7 desktop including start menu and menus for computer illerate people (like my mum). Telling them to re-learn does not encourage them to use technology.
Me? Win 7 and Ubuntu for PC's , Android for tablets. Does what I need.