[evnu]

> For example: I wonder if it wouldn't be more "erlangy"/"elixiry" to model the mutable ops behind a genserver that you send messages to.

It depends on the use case. For example, when creating a resource (basically a refcounted datastructure), it might make sense to allow mutable access only through a process as the "owner" of the resource. But if you have only read-only data behind that resource, sharing the resource similar to ETS might be what you want.