I think actors, at a certain point in their careers, decide they're either going to keep taking risks or take the exact same risk over and over again so that it's not a risk anymore. That's when I don't want to work with them. I think there are some actors who are just doing the exact same thing, and they will never shift from it.
The notion of a conscious model of oneself as an individual entity actively trying to establish epistemic relations to the world and to oneself, I think, comes very close to what we traditionally mean by notions like "subjectivity".