Not only that: It protects your data. The Unix security model is unfortunately stuck in the 1970s: It protects users from each other. That is a wonderful property, but in todays world you also need to protect the users from the applications they are running: Anything running as your user has access to all your data. And on most computer systems the interesting data is the one the users out there: Cryptogrqphic keys, login information, financial information, … . Typically users are much more upset to loose their data than about some virus infecting the OS files, those are trivial to fix.
Running anything as anlther user stops that application from having access to most of your data.
My coworker used it till his HDD broke, taking his key into data heaven. The repository is still online thanks to radicale, but he has no way to ever get push access to it again.
So it is useless as any misstep can potentially kill your access to the repo.