The question of whether this is overly complicated is a wrong question. While in most cases this might be too much, there are situations where this is necessary

The question of whether this is overly complicated is a wrong question. While in most cases this might be too much, there are situations where this is necessary. It all depends on the use case. I for one welcome the description of high-traffic production level architecture description. Usually on the internet, it is hard to find a real setup description. Most of architecture examples are simple, not something you would use in production yourself. Plus, simplifying architecture is always simpler, than thinking how to make it scalable properly.