> I think Alan Kay himself has suggested that what he really wanted when thinking of OOP was something more akin to the Actor model as espoused by Hewitt and realised by Erlang and to a lesser extent Scala on the JVM.

> This model gives full benefit of FP at the actor level whilst being realistic about distributed messaging semantics.

It's interesting you bring that up; I normally am very much on the 'Use interfaces and Dependency injection instead of inheritance' camp. And yet, When I work with Actor Model frameworks (Mostly Akka/Akka.Net) I find places where using some simple inheritance is insanely powerful yet intuitive. You wind up getting something in-between OOP and AOP with the results.