This is 100% why I loved that episode, too. It was so beautiful, so nuanced, and so much more about the characters than the too-often hokey alien-of-the-week business that Doctor Who can get mired in. This episode, I felt like, was actually IMPORTANT, and it was neat that it was able to do so with one of the episodes that is usually the type that is sort of comedic, every season's requisite Wacky-Historical-Figure romp. There was that, but it was so much more.