True. Novelizations are written from non-final scripts (see Kirk getting shot in the back in the hardcover edition of the
Generations novelization), and the studios in general became tighter on timelines and more restrictive on access. I feel like I've heard an account of a novelization that was written in a sealed room under lock and key, and even one where the author could read it on premises but not have it in front of him when he wrote so scenes had to be written from memory. I can't remember what I ate for dinner yesterday, so I'd be useless for a gig like that.