I think ots has to do with tv shows and their growing status the last 20 years. The stars are connected to a certain show and a certain character for years. During that time its hard to do a lot of other movies, and you become the charcter instead. Walter white, tyrion lannister, johhny lawrence. You think about the characther and not the actors name. Compare that to jim carrey, samuel l jackson and brad pitt, sometimes it even hard to remember their characters name. Its more like the old trailer " Brad Pitt is ......!"