I don't find Nix the language particularly weird. But pick an arbitrary .nix file, see a bunch of stuff passed to the derivation, and try to find out whence it comes, and what types / attributes are expected there. The only definitely working solution I know is a full-text search over the file tree.
Now compare it even to Haskell, to say nothing about e.g. Typescript.
Now compare it even to Haskell, to say nothing about e.g. Typescript.