However, by separating out into Erlang's lightweight processes using actors, you enable your code to make use of massive concurrency and thus of what Erlang is

However, by separating out into Erlang's lightweight processes using actors, you enable your code to make use of massive concurrency and thus of what Erlang is good at. From a certain level of concurrency onwards in a big enough problem to solve, the imperformance of message passing becomes less relevant in comparison to being able to process concurrently in many lightweight processes. So one could argue, that indeed some focus on actor systems is not entirely missing the point.