Interesting! Not trying to divert from Akka which is a wonderful piece of engineering, but your comment reminded me of Microsoft’s take at the Actor model with Project Orléans - which was used for the backend side of the Halo / XBox MMO [0].
I think the GA version of Project Orléans is now called Service Fabric, although I never had the pleasure to try it.
[0] https://youtu.be/I91ZU8tEJkU