Have you actually attempted to use it recently? Are you familiar with the WSL1 bugs that surface when running random Linux distros?

(To be clear, I haven't tried this with Nix, but I have with other distros.)

Fair question! Nope. I'm not endorsing it, and certainly don't know (or even suspect) it would solve this issue. I just recently installed NixOS and was surprised to see Windows mentioned on the downloads page, so looked into it a bit. Maybe soon.