Writers should see this doc. Ron D Moore, Robert Hewitt Wolfe and two other great DS9 writers break a new DS9 story in their Writers Room right before your eyes, whiteboard the whole thing. And as for Vedek Kira Norise and the fate of Captain Nog...
Most fascinating for me - they came up with the beats because they felt right, then figured out where it was going and wrote it that way. The style was more -- "where would Kira be twenty years from now -- well, she'd be a Vedek and DS9 would be a religious shrine for The Sisko. But what would that mean..."
The "what would that mean" is where they grew the rest of the story points from. Like I said, great watching professional writers at work.
The doc is mostly about the WRITING of DS9, even with all the actors checking in and the beautiful new HD footage.