[antocv]

apt-get can not install the same package/software in many different versions, there is always some package conflicts happening and you cant describe the state of your desired system with any "apt-get" language. You must script your desired state manually or use puppet or chef or whatever, which will perform the steps/tasks that you desire on your system using multitude of software and languages.

With guix gsd and nixos, the package manager is the configuration manager. The package manager is not just package manager, its not just apt-get, it is also puppet/chef/salt, and a distribution-maker or manager. I believe with guix you could make your own distribution (software collection) in the same descriptive language as making packages. You cant do that with apt or any debian tools.