> This is super-unrealistic. State mutation legitimately happens through many channels. The trick is signaling to the application layer that state has changed a

> This is super-unrealistic. State mutation legitimately happens through many channels. The trick is signaling to the application layer that state has changed and either the app needs to reload it or update it. 13 years in professionally, many companies, many contracts, and many projects later I've yet to see a system where it wasn't the case. Small or large (16k/rps at the large end). Startup and "enterprise". And why wouldn't it be the case? Why not have your data flow through a "central" business logic layer?