Use Bluefin or some other immutable/atomic distro.
The upside is that it’s rock solid and will likely never fail in a way that cant be easily rolled back. The downside being that it’s slightly more complex to administer than a traditional distro model (which probably isn’t a big problem if you are going to be administering your SO’s PC for the most part.)
Bluefin is basically a more general desktop, less gaming-focused version of Bazzite. Bluefin uses Gnome, but there’s also a KDE Plasma version called Aurora.
On the bright side, it’s never been a better time to switch to an immutable distro…