This configuration separates the System Configuration and the Home Manager Configuration into separate flakes with a unifying flake for Global Configuration.
Programs with a lot of configuration which do not make sense to be handled in the main system tree due to sheer size of configuration are placed in packages.
Diagram
The mental model for this system should be something like the following:
graph TD; A(Global Flake) B(System Configuration Flake) C(Home Manager Configuration Flake) D[(Packages)] A --> B; A --> C; D --> B; linkStyle 2 stroke-dasharray: 5,5 D --> C; linkStyle 3 stroke-dasharray: 5,5