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Is that a nix thing, a nixOS thing, or a Rust thing ?

It's due to NixOS not having a FHS, which is basically standardized lib paths that are required for dynamic linking. So if your crate depends on something like glibc, you need to write a nix flake to setup your environment. So unlike another OS you need to know what all the sys dependencies are.

Which I would argue is a good and bad thing. Bad because it requires more developer work; but good because it requires you to be explicit about dependencies (and thus lowers the likelihood of your app not running because of a missing dependency or incorrect dependency version).

an intersection. Nix is the best C/C++ package manager and meta-build system, but Rust deviates heavily from C. so, here comes Crane and such