> You wouldn't implement the "plus 2" program in an actor system this way, because of race conditions.

Can you explain how a serially-executed "increment" message in an actor system, as I've described above, would cause a race condition?

In an OOP system you could do the same, you'd just have to build the thread-safe message queue yourself. In actor languages it's built in.

There are cases where you can get race conditions in actor languages, but I'm pretty sure this isn't one.