This is totally different from systems that scale, where any application "state" is just transient from a request or message in order to facilitate a mutation i

This is totally different from systems that scale, where any application "state" is just transient from a request or message in order to facilitate a mutation in a dedicated store outside of the app. It's notable that this is the model on which the world is built. This is the model that runs almost all the biggest systems in the world.