Simplicity doesn’t define a functional capacity. Instead, it stands for reduced connectivity.
Video no.2 | Subtang
I want you to imagine two different processing systems, but before I set the scenery for you, let me introduce you to the components of a system in a layered hierarchy. So you can obtain a better understanding of the big picture. Complex systems evolve from simpler subsystems [1], which means all the components in the system mature through connectivity in a fluid hierarchy. There are two terms here; I want you to pay attention to simplicity and fluid hierarchy.
Simplicity doesn’t define a functional capacity. Instead, it stands for reduced connectivity. Simpler subsystems have fewer connections, so they respect the higher ones but still work at the highest capacity to generate output for the system. The fluid hierarchy, on the other hand, ensures the continuity of the system, no matter what. It gives simpler subsystems priority to step in and run the operation when the higher system is too weak or slow [2] to fulfill the purpose of the system around the core function.
[1] John Gall, Systemantics: How Systems Work and How They Fail, 1975
[2] Brian Whitworth, BSc, BA, MA(Hons), Ph.D., The Brain and Technology: Brain Science in Interface Design | Encoding, interaction-design.org