NixOS packages only work with NixOS system. They're harder to setup than just copying a docker-compose file over and they do use container technology. If the idea is to remove complexity from the setup, NixOS goes in the opposite direction.
Also without containers you don't solve the biggest problems such as incompatible database versions between multiple services.
I stand by what I said, I can give a 2 step tutorial on setting up any docker system (copy this compose file, run up on it), anything simpler than that wouldn't be as robust in terms of configurations.