"All of this is trivial." No, describing it in English on HN is trivial. Getting all of this to work in the really real world is incredibly difficult and time

"All of this is trivial." No, describing it in English on HN is trivial. Getting all of this to work in the really real world is incredibly difficult and time-consuming. Components and infrastructure will inevitably find novel ways of failing that your three-bullet architecture didn't take into consideration. That said, I agree that this is a problem that can be solved with a message broker. I just don't think it is easy. If you can make a system work with fewer moving parts, then you probably should.