What Nix for Mac needs more than anything is a great, simple overview of how to use it in practice, for casual users. I use it as my main package manager, but I install software with it rarely enough that I need to dig around in the manpages every time.
I see that there's a bunch of `nix-whatever` tools around, but even their names aren't much sensible.
I'm not in doubt that nix is technically superior to homebrew, but UX-wise it's at least been a disappointing experience for me.