I’m going to take this off in a slightly different direction. You should not be focusing on the Actor model at all. What initially drove Erlang’s design was fault tolerance. It was built in industry, not academia. Ericsson needed software that kept running in the face of errors. They only accidentally re-invented the Actor model because of that focus on fault tolerance and supervision.
The way I’d phrase an answer to your question, is that the Actor model is the best way we know how to build fault tolerant systems today, but since fault tolerance is the primary driving design choice among the BEAM community, if a better way is discovered, I would expect them to embrace it.
