Fair enough, we just mean different things by "complex" I guess. Obviously the message-passing model isn't good for everything. It is good for a lot of real-wor

Fair enough, we just mean different things by "complex" I guess. Obviously the message-passing model isn't good for everything. It is good for a lot of real-world stuff though, which is why I was surprised by your statement before. Note that serialization is not necessary in this model, for example you can have actors in the same process, and transfer ownership of objects. So there is no shared state, and they are logically passed as messages, but there is no copying cost to doing so or need to implement serialization.