Seconding and thirding the use of an immutable OS. I specifically like Bazzite Gnome. People know it for gaming, but many don’t know it has a fantastic desktop mode, suitable for children, mums and grandmas.
Almost all the software a casual user needs is available from their Flatpak App Store, and it’s pretty as hell (looks very Apple-like and shiny). I have been using it for about a year and I am still impressed how fluid, polished and solid everything feels.
Me too. The Bazzite desktops are amazing.