At first I didn’t really like how the talk got along. My usecases do rarely rely on external api’s and I really hoped to get some insight into using GenServers in a more secure way (aka do not loose data) in an app, which is backed by postgres and where data needs to be stored savely by myself and not by an external provider. Only a bit after I finished watching the talk I realized, that I could treat my postgres database the same way as an external api. For saving data send it to the db and for retrieval ask the fleet of GenServers, which can handle things like timeouts on stale data and refresh rates. But I think in such a usecase this would mostly make sense if the performance benefit is really needed.

Happy to answer any question!