> I've found the Nix ecosystem to be lacking, missing packages, wrongly built packages (from the official upstream), and out of date versions. Homebrew still outclasses Nix in this regard (quality over quantity).

That's also the case with the Docker ecosystem. On top of that, you need to take into account the base image, versions, etc.

At the end what I look for is for a project being able to build my source code with runtime dependencies and supporting tools that won't change overtime for the architecture that I need.