If I feel like it's a well-written script and if it speaks to me, it's something I want to do. I usually rely on my instincts when it comes to a script.
I think it is fair to say that it is under a great deal of stress, and if I am asking for significant changes, it is because the world is going through significant changes.
All the revision in the world will not save a bad first draft: for the architecture of the thing comes, or fails to come, in the first conception, and revision only affects the detail and ornament, alas!