It is just hard to comprehend all the communication pathways and what happens in the system.

Having worked on large scale actor-based systems before, I'll attest this is quite true. However, what often gets lost in these conversations is that this is also true of large scale OOP based systems as well.

If one takes a few steps back and squints, there's really not much difference between Objects and Actors: in both cases you have a namespaced entity (object, actor) that receives signals via some defined mechanism (methods, messages) which lead it to perform some action.