People often confuse simple for easy. What looks simple from outside, actually took a lot of work and thinking to make it that simple.
This is why most things are simple and straightforward. It takes a good amount of thought process and execution to get to something that’s simple and effective.
Simple is not easy. Contrary to what most people believe. But once you do that work to build simple things/systems. They’re easy to replicate.
Simple is hard to create but easy to replicate.