Yes, if someone use only web apps, then switching from Windows to Linux is really simple. I sometimes use also Zorin OS, with little tinkering it could look almost exactly as Windows 10 - including the icons and the wallpaper. Moreover, after several months of using Linux, we can ask those people (especially elder people) if they notice something. Usually not, or someone tell that the system is faster, it can start in few seconds, etc. Only if I asked them, they realized that the annoying windows updates on shutdown have gone...