The Wormhole wrote:
To everyone saying that the Ponds weren't important to the story, maybe I'm not remembering but didn't Amy serve as the Doctor's conscience making him remember his morality. I thought that was the most important scene in the episode and it featured Amy at least.
Thing is Amy wasn't really needed for that. That scene could have featured any companion and it would be the same. Hey, it could have carried more resonance with a former companion seeing the Doctor become this dark and uncaring.
That's a very good point. I think that's what they were trying to do with Amy. However, because we didn't experience that gap, it lost its impact. However, for any past companion where there has been a significant gap in screen time, that would be a great contrast.