@arroz “Service” attitude sounds about right. It is a logically separable module, and it must be async because it may take significant time to execute the work (in relation to display refresh time). If mutable data objects are trivial and can live on the main thread — why complicate things. Making and guarding an island has a cost attached to it (code complexity and performance), so it needs to be worth it. It’s like architecturally you should be fine to move an actor to another hardware node.