Brian Koppelman said this quote

“ Watch movies. Read screenplays. Let them be your guide. […] Yes, McKee has been able to break down how the popular screenplay has worked. He has identified key qualities that many commercially successful screenplays share, he has codified a language that has been adopted by creative executives in both film and television. So there might be something of tangible value to be gained by interacting with his material, either in book form or at one of the seminars.But for someone who wants to be an artist, a creator, an architect of an original vision, the best book to read on screenwriting is no book on screenwriting. The best seminar is no seminar at all.To me, the writer wants to get as many outside voices OUT of his/her head as possible. Experts win by getting us to be dependent on their view of the world. They win when they get to frame the discussion, when they get to tell you there’s a right way and a wrong way to think about the game, whatever the game is. Because that makes you dependent on them. If they have the secret rules, then you need them if you want toget ahead.The truth is, you do ”