I feel like the problems you're citing (inability to simply roll back, etc.) aren't really Arch problems specifically—you'd have them in any traditional distro (like Debian) too, right?
Oh yes, absolutely, I'd surely screw up equally often if I was using Debian, Ubuntu, Fedora or any other distribution, if not more. I was just comparing Arch to NixOS as Arch is my daily driver, while I'm evaluating the switch to NixOS.