I thought they'd have started writing the text for the companions and others by now, or at least making drafts.
There is a difference between general plot points, general characterizations. And then charting out every nuance of dialogue direction due to player decision making, and actual writing out the exact lines with the proper character voice.
In fact, if you can't implement what you had planned to implement. The writing is the best way to warp to those changes. The trick is to still get compelling dialogue out of the final variation of the game, which may not be locked in until rather late in development.