I found the main issue with many non-rolling release distributions are the upgrade instructions from one stable release to the next, and not the difficulty of installing them.
I'm myself a Archlinux guy, but that does sometimes require some carefulness and regularly (at least weekly) applying updates and does not have stable automatic updates, so I started installing Fedora atomic desktop distributions (Fedora Silverblue/Kinolite/etc.) for people that just want to use their device for basic stuff.
The reason for that is long term maintainability without an expert at hand.
I had so many bad experiences updating distributions from one stable version to the next, be it Debian and Ubuntu-based, or Fedora-based distributions.
And with those atomic desktop distributions the amount of moving parts is much lower, so hopefully upgrading them to newer releases is much more stable.
So I would suggest giving Fedora Silverblue (Gnome desktop), Kinolite (KDE) or Budgie Edition a try.