I rarely write these shorties with links, but I REALLY think you should read this excellent article in Backstage.
Please read it. You’ll greatly benefit from it. It’s very interesting and it was hard to find!
It’s an excellent look at the various approaches to acting (particularly American) but it gives Karen Kohlhaas a chance to express about Practical Aesthetics and gives Larry Moss a chance to call Mamet ‘asshole’. Moss says he’d say it to his face, I reckon Mamet would kick his ass.