According to Carl Hewitt, the actor model is based on physics (especially quantum physics). Doesn't this then imply that the natural scope of such a system entails huge numbers of actors, interacting in a probabilistic way?

So in order to understand our systems with huge graphs of actors, we should attempt to develop something akin to the heat equation for actors. Trying to understand the behaviour of every individual actor in the context of the whole system is just too much.