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this is a topic i've been heavily involved with because i still consider myself to be someone who prefers using technology at a very beginner friendly level, plus it's very good when a linux operating system makes you feel right at home when it has a modern desktop environment. this is why i really like gnome, its simplicity and usability is something available for everyone, for beginners and for a lot of other people, but if you had to, say, rearrange xfce or kde for someone who was an elderly person or an absolute beginner so that they wouldn't have any trouble using linux, how would you do it? (screenshot is my current linux mint desktop, very simple and extremely user friendly!!!!)
I have both my parents on KDE with essentially the defaults. They came from Windows 7, so many things were familiar to them, like the systray in the bottom-right, the start-menu in the bottom-left and so on.
I mostly decided to go with KDE, because I use it myself. My dad can be extremely negative, so being able to tell him, nope, it works on my machine, often defuses the situation. But I also expected my parents to potentially want lots of little tweaks, which well, it didn't happen.
They use a browser and a printer, that's basically it. I have considered setting up an E-Mail client for my dad, and thought about setting up tiling window management for my mum, but done nothing so far. The OS could boot straight into Firefox and they would hardly notice.
As such, I'm definitely fine with how little problems they've had using KDE.
One time, I noticed my dad had a million tabs open in the file manager, because that got updated to remember open tabs, and something he did, would always open a new tab in there. Another time, he had managed to create a second panel, which sat at the top of the screen wasting space.
So, it would be somewhat nicer, if he couldn't do that stuff, but at the same time, it's not really a problem and I learned computers by dicking around, too, so I really don't feel like I want to lock that down somehow.
A dumb thing he did one time, which he could do independent of the desktop environment, is that he deleted all the folders in his home-directory. Intentionally. He has this habit of cleaning everything up, completely disregarding that he has like 99% free storage space. Again, he doesn't really use much beyond a web browser, and he didn't find out about hidden folders, so the only real effect was that his wallpaper disappeared.
I don't think that's the answer you wanted, but yeah, I would not want to lock them down to prevent this stuff from happening, unless it really becomes a problem.