Shaw is like a train. One just speaks the words and sits in one's place. But Shakespeare is like bathing in the sea - one swims where one wants.
For example, the opposition between acute and grave phonemes has the capacity to suggest an image of bright and dark, of pointed and rounded, of thin and thick, of light and heavy, etc.
I feel like people want there to be this mystery between film and theater, but I just kind of went where I got jobs, you know?