It's always amazing how seemingly smart and accomplished people can say dumb things. "Every real screenwriter uses Final Draft," being a prime example. Talent and imagination are not supplied by a software program. The golden age of screenwriting was back in the typewriter era. Screenwriters don't pay any attention to that kind of garbage. Go ahead and use anything you want. Celtx. Writerduet. Word. It's all about the story, not the program.