In the depths of their souls, the overwhelming majority of actors, regardless of which school they belong to, are supporters of the creative process onstage, i.e. experiencing. Instead of seriously and truly accepting all the circumstances of a character and then growing agitated, joyful or desperate from that, actors usually try to summon up whatever emotion they deem necessary at a given point out of nowhere, without paying any attention to "circumstances". The issue is that they obviously consider emotions to be most important. In their minds, emotion equals experiencing. Emotion is truth. Since a person has emotions, he's obviously living. And since he's living, it's obviously the truth. Every great actor consciously or subconsciously understood this, consciously or subconsciously found a path to the truth in his role. The earlier they catch on to this and the more artfully they do it, the farther away they get from truth, experiencing, and naturality.