Nix has its place in the Linux ecosystem but I would never blindly recommend it to someone. It’s a niche distro for a niche set of people. This person is afraid the Linux quirks are too much for them and you throw them Nix. That’s an awful fit.

Try Linux Mint instead, which is a very user friendly distro.

I see Endeavour as Arch with sane defaults. They also use the Arch repos, if the distro dies I’m not really affected.