1. Akka, Erlang, Orleans are not using Actor Model. They are using something that resembles it, e.g. having primitive data types instead of using actors to repr

1. Akka, Erlang, Orleans are not using Actor Model. They are using something that resembles it, e.g. having primitive data types instead of using actors to represent them. Not everything in them is actor - just the very coarse code constructs. 2. To me Halo 4 is the client-side part. I seriously doubt they have used any Orleans there and would bet it is a very monolithic old-school C++ app, thus the title is misleading.