Archlinux is a rolling release distro. Which mean you are supposed to:
- update them very frequently
- check the news before any update which mention any manual intervention needed
This is definitely a distro for people who want to get involved in the sysadmin part of it. A distro like Fedora will have a new release every 6 months and each release and ~390 days of support. You aren't expect to do manual intervention, just let it update itself upon reboot/poweroff from times to times and do a major upgrade, every 6 months to 1 year. Debian has 2y releases cycles and +- 3y of support, in the ubuntu world it is like Fedora or LTS (5y of support). If you want the longest extended lifecycle, RHEL and its clones have pretty much 10years of support without any fuss. Add to that the immutable distros like Fedora Silverblue, OpenSUSE MicroOS and some others where it is virtually impossible to make it shit the bed, even while being stupid.
So in the linux world you can definitely choose your poison, from the less eventful one to the one needing more attention. It looks like you didn't choose wisely. If I had to setup a distro for the least knowledgeable people, I would set it up with an RHEL or Almalinux and install a more modern browser through Flatpak. As long as the hardware is supported from day 1 they would expect a desktop that do not change at all for 10years.